AcetateAcetate, specifically cellulose acetate, is a plant-based plastic that is made from natural cotton and wood fibers. This eco-friendly material was first used for eyewear in the late 1940’s as a means to replace previously used plastics that were easily broken. Cellulose acetate is considered one of the highest quality materials to use for eyeglass frames because they are strong, lightweight, and flexible. Cellulose acetate is also pretty dynamic -- available in a range of transparency, rich colors, and finishes.
Adenosine Triphosphate (ATP)This complex organic chemical participates in many biological processes and is basically the the energy currency of life. It serves as the main energy source for metabolic functions, and it is responsible for storing and transporting chemical energy within cells.
Amber LightAmber light is also sometimes referred to as yellow light therapy. It encompasses the range of wavelengths from 570 nm to 620 nm.
AntiagingOur bodies are made of millions of cells, which are strong, resilient, and and can easily replicate as an infant, child and young adult. As we get older, we age. From a biological standpoint, our body’s ability to generate new cells diminishes, and cell death occurs. Antiaging involves using tools and products that help delay, stop or reverse the natural aging process that occurs in humans.
Anti-inflammatoryThe property of a substance or treatment that helps reduce signs of inflammation, such as swelling, tenderness, fever, and pain.
Anti-reflective (AR) CoatingThis is a coating that is applied to the surface of a lens. It allows more light to pass through the lens to your eye, giving you sharper and clearer vision, and allowing you to relax your eyes while you wear your glasses to help minimize eye strain. This type of coating is designed to reduce the amount of glare that reflects off your lenses -- so people will be able to see your eyes better.
ArmAlso known as the temple, this is the piece of the eyewear frame that extends over the ears to help hold the glasses in place.
Artificial LightAlso known as man-made light, this refers to any light source that is produced by electrical means as opposed to natural light from the sun or fire. Artificial light sources can include incandescent bulbs, halogen bulbs, fluorescent bulbs, sodium-vapor lamp (typical street lights) and light-emitting diodes (LEDs). Artificial lights are available in a wide variety of shapes, sizes, colors of light emitted, and levels of brightness. They are used in many different residential and commercial applications.
BenzodiazepinesA class of psychoactive drugs that trigger a tranquillizing chemical in the brain and are used to treat a range of conditions, including but not limited to anxiety, insomnia, and alcohol withdrawal. Examples include: Xanax and Valium.
BiohackingThe art and science of changing the environment around you and inside you, so you have more control over your own biology, according to Dave Asprey, the creator of "biohacking".
Blood CirculationThe blood circulatory system (cardiovascular system) carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart. The pumping action of the heart helps distribute nutrients and oxygen to your cells, and removes waste from the body.
Blue BlockersSpecialized glasses that were originally created by NASA's space program in 1986 to help astronauts protect their eyes from harmful wavelengths of light, including blue light, UVA and UVB. The original blue blockers had orange lenses; however, we now know that the body needs different amounts of (natural) blue light throughout the day in order to keep your sleep/wake cycle on track. Our recommendation is to wear clear or yellow lenses during the daytime, which block 40% and 75% of blue light, respectively. For night time, it's best to choose eyewear that has red lenses, and that specifically blocks out not only blue light, but also green and violet light.
Blue LightThis is part of the visible light spectrum, and it includes a range of wavelengths that sits between green and violet. The sun notably emits natural blue light, which gives very important cues for biological processes (for humans, plants and animals). In the morning, blue light from the sun signals to your brain (through your eyes) that it's time to wake up and start your day. As the sun descends below the horizon, your body then begins naturally producing melatonin to help you fall and stay asleep at night. So, blue light is very influential on your natural sleep/wake cycle. With that said, our society no longer solely relies on sunlight and fire to brighten our homes and surrounding areas; we now live in a world in that uses artificial (blue) light almost 24/7. From the time we wake up to the time we go back to bed, we are all constantly exposed to the blue light that comes from LED and/or fluorescent bulbs -- in our homes, offices, gyms, malls, grocery stores, airports, etc. All digital devices with an LED screen also emit blue light. Over the past couple of years, there has been growing concern about the effects of overexposure to blue light on human health. A recent study by the University of Toledo has confirmed that this overexposure can lead to macular degeneration, the leading cause of blindness.
Blue Light TherapyA drug-free, non-invasive form of treatment that uses specific wavelengths of blue light to kill off bad bacteria and/or support the liver. This form of light therapy may be ideal for very extreme cases of acne or MRSA. Blue light therapy has also historically been used on babies that are born with jaundice. Please consult with your doctor to see if blue light therapy is an ideal solution for your individual medical case.
BridgeThe small area of your glasses that arches up over the nose between the lenses. The purpose of this part is to help support the weight of the glasses.
CaffeineA stimulant that is found naturally coffee, tea, and cocoa. There is also synthetic (man-made) caffeine, which can be added to foods, medicines, and drinks. This particular substance stimulates your central nervous system, which can make you feel more awake and give you a boost of energy. If you have to much of it and/or consume it too late in the day, then it can have negative effects like making it more difficult for you to fall and stay asleep at night. Other possible side effects include: restlessness, headaches, dizziness, dehydration, and anxiety.
Cellular HealthThis refers to how well your cells -- including the proteins, mitochondria, and DNA inside of them — are functioning. If you have good cellular health, that means that your cells are able to repair and replicate themselves (in addition to carrying out their specialized functions). However, as we age over time, our cells are less apt, leading to a gradual accumulation of damage. Poor cellular health can affect your organs and put you at greater risk of experiencing some type of illness or disease.
Circadian LightingA lighting system designed to mimic the natural rise and fall of the sun throughout the day, as its position, angle, and color in the sky changes. This is a relatively newer concept for lighting systems that is thought to be healthier because it has the potential to help keep your natural circadian rhythm aligned with the sun's 24-hour cycle. The benefits of human-centric circadian lighting design include:

Increased alertness in the morning
Improved focus and productivity
Improved mood
Reduced hyperactivity
Fewer errors or accidents
Better sleep at night
Circadian RhythmA natural, biological process that regulates the sleep-wake cycle and repeats roughly every 24 hours, like the rise and fall of the sun. Your body actually has several circadian rhythms happening throughout the day (and night), but when we refer to your body clock, we are speaking to your sleep/wake cycle that is largely influenced by light and temperature, and that in turn influences the rest of your body's smaller clocks. Learn more about circadian rhythms and health here.
CollagenThe most abundant protein (accounting for about 1/3) in the human body -- found in the bones, muscles, skin, and tendons -- that helps provide both strength and structure. Collagen also plays a role in replacing and restoring dead skin cells. As we age, we produce less collagen, and the structure of our skin naturally decline, leading to more wrinkles and lines.
Color TemperatureA way to describe the appearance of light, measured in Kelvin (K) on a scale from 1,000 to 10,000. Color temperatures over 5000 K are called "cool colors" and have a bluish appearance. Lower color temperatures (2700–3000 K) are called "warm colors", and they have a yellowish appearance. In this context, "warmth" is an indicator of radiated heat rather than temperature.
Computer Vision SyndromeAlso referred to as digital eye strain, which can result from prolonged use of digital devices with LED screens -- such as computers and tablets. Common symptoms include: eyestrain, headaches, blurred vision, dry eyes, as well as neck and shoulder pain.
ConesThe photoreceptors in the human eye that are responsible for seeing colors.
CorneaThe transparent front surface of the eye that acts as its outermost lens. It lies directly in front of the iris and pupil, and it allows light to enter the eye.
CortisolOften called the "stress hormone", and is made in the adrenal glands. It can help control blood sugar levels, regulate metabolism, reduce inflammation, and assist with memory formulation. Your cortisol levels naturally increase in the morning when the sun rises, and then they dip back down at night. This pattern repeats every 24 hours along with your circadian rhythm.
Cytochrome C OxidaseAn enzyme found in the mitochondria of bacteria, archaea, and in eukaryotes. It is responsible for catalyzing the final step in the mitochondrial electron transfer chain. Deficiency in the activity of cytochrome c oxidase has been associated with a wide range of human disorders, and is one of the most frequent causes of mitochondrial defects (NCBI).
DermisAlso called corium, this is the thicker layer of skin that is located below the epidermis and above the superficial fascia. It is comprised of connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. (NIH).
DetoxificationThe metabolic process of removing toxic substances or qualities from the body. We are specifically interested in how light therapy can detoxify the body by increasing blood circulation and removing potentially carcinogenic heavy metals (like lead or mercury), as well as alcohol, nicotine, sodium, and sulfuric acid. This process can help relieve certain health symptoms, prevent illness, and increase overall vitality.
DNAShort for deoxyribonucleic acid, DNA was first observed in 1869, but it wasn't until 1953 that researchers determined that its structure -- a double helix -- contains important biological information. This is basically the thing that makes you uniquely you, and all other organisms unique too. DNA is the hereditary genetic code that determines all characteristics of a living organism, and it is the primary component of the chromosomes found in cells. See: cellular health. Note: a 2017 study published found that random mistakes or mutations in DNA, (not heredity or environmental factors), accounts for two-thirds of cancer mutations in cells.
Drug-FreeAll natural, not involving no administration of drugs of any kind.
Dry EyeAn uncomfortable condition in which a person isn't producing enough tears to lubricate and nourish the eye. This can be caused by starting at screens for extended periods of time. Symptoms include: a stinging or burning sensation in your eyes, sensitivity to light, eye redness, blurred vision or eye fatigue.
Electromagnetic SpectrumThis refers to a continuum of all electromagnetic waves and their respective frequencies. This spectrum includes includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays.
Energy DensityThe amount of energy in a given mass (or volume). A good example of this is food; we measure the energy of food in calories.
EpidermisThe outermost layer of the skin that provides a waterproof barrier and creates our skin tone. This layer helps to protect us against water loss and from environmental pathenogens. It also regulates gas exchange and helps us absorb water and mineral nutrients. Within the epidermis are melanocytes -- cells that produce melanin -- which gives the skin its color.
Eye StrainAlso known as eye fatigue or digital eye strain, this is a relatively common condition that occurs when your eyes get really tired from being overworked. It is often caused by intently staring at computer screens and/or other digital devices, while driving long distances, or exposure to very bright light. Symptoms may include: tired, stinging or itching eyes, blurred vision, a headache, increased sensitivity to light, difficulty concentrating, or feeling as though you cannot keep your eyes open.
FDAShort for Food and Drug Administration. This organization is responsible for protecting the public health by assuring the safety, efficacy, and security of human and veterinary drugs, biological products, medical devices, our nation's food supply, cosmetics, and products that emit radiation. (USAGov)
FitDo your frames fit? Here are a few things to remember when choosing the right glasses: Your pupils should be aligned in the center of each lens. Your eyebrows should be visible above the tops of the lenses.
The frames shouldn’t slide down your nose. Certain styles fit different faces better than others. Check here to see which TrueDark frames would fit your face best.
Fluorescent Light (CFL)A light source consisting of a long glass tube that is lined with a fluorescent phosphor and contains mercury in a partial vacuum. An electrical current causes the mercury to emit ultraviolet (UV) light, which in turn causes the phosphor to emit visible light. Fluorescent lamps and light bulbs were designed to replace incandescent and halogen bulbs as an energy-saving alternative. They have been widely used in commercial buildings for decades because they require less energy and last much longer than incandescent lighting. However, this type of lighting emits cooler color temperatures, which means that overexposure to fluorescent lighting can disrupt your circadian rhythm. This light source is also known for flickering (rapid fluctuations in the voltage of the power supply), which can be pretty unpleasant for your eyes, mind and body.
Frequency (of a Wave)The number of waves that pass a fixed point in a given amount of time, measured in hertz (Hz).
GlassesAlso known as eyeglasses or spectacles, this is what we sell. 🙂 TrueDark glasses deliver premium quality protection for your eyes with the help of polycarbonate lenses, as well as acetate or aluminum frames.
GlaucomaA common condition that causes damage to your eye's optic nerve and gets worse over time. It is often caused by an abnormally high pressure in your eye.
Green (Visible) LightThis accounts for wavelengths 560–520 nm within the visible light spectrum. Studies have shown that overexposure to green light at night can make it more difficult to fall and stay asleep.
Halogen Light BulbA type of incandescent lamp that uses a tungsten filament and halogen gas. When the filament is heated sufficiently, it emits light or “incandescence.” Halogen lamps are used in a variety of both commercial and residential applications. Halogen lamps are used in automotive headlamps, under-cabinet lighting, and work lights. one potential downside is the heat generated by halogen lamps
Healthy LightingSee Circadian Lighting. Here is another article that might be helpful.
HemoglobinA protein in red blood cells that transports oxygen from the lungs to the tissues of the body. It is what gives blood its red color.
HypodermisThe innermost (or deepest) and thickest layer of skin -- underneath the dermis and epidermis. It is also known as the subcutaneous layer or subcutaneous tissue. This layer contains fibroblasts, adipose tissue (fat cells), connective tissue, larger nerves and blood vessels, as well as macrophages, which are cells which are part of the immune system and help keep your body free of intruders. (VeryWell)
Incandescent LightWhen the filament is heated sufficiently, it emits light or “incandescence.” For decades, incandescent bulbs were the primary lighting source for homes, industry and grow lights. However, their popularity has declined over the years as more energy efficient options (like LEDs) have been developed. Incandescent bulbs notably only convert about 5% of their energy into light, with the remaining energy converted to heat. Still, it's worth noting that incandescent bulbs are actually much healthier to use than their fluorescent and LED counterparts.
InflammationA biological response and defense mechanism in the body, in which the immune system recognizes damaged cells, irritants, and pathogens as a result of physical injury or an infection, and it begins the healing process. Symptoms of inflammation may vary depending on whether the reaction is acute or chronic. Pain, redness, immobility, heat, and swelling are considered acute inflammations specifically of the skin. It is possible to experience inflammation deep in your body, like in your organs; however, symptoms may not be as obvious. Chronic inflammation may result in: fatigue, mouth sore, chest pain, abdominal pain, fever, rashes, or joint pain.
InsomniaAlso known as sleeplessness, this is a sleep disorder that regularly affects millions of people worldwide. It is characterized by difficulty falling and/or staying asleep. Causes of insomnia include psychological factors, medications, and hormone levels. Treatments for this condition can be medical or behavioral.
IrradianceAlso known as power density. When using light therapy to heal the body, this is the amount of energy that the targeted part of your body receives while using the light. It is measured in milliwatts per square centimeter (mW/cm²).
Jet LagA condition that is characterized by various psychological and physiological effects, which results from alterations to the body's natural sleep/wake cycle. Symptoms may include may feeling drowsy, tired, irritable, lethargic, and slightly disoriented. Jet lag is a common condition, especially when traveling on long-distance trans-meridian (east–west or west–east) journeys. Learn more about how to avoid jet lag and enjoy traveling here.
Junk LightThis term was coined by our founder, Dave Asprey -- as he says, "Junk light is WORSE than junk food." It refers to blue, green and violet wavelengths that are emitted from artificial light sources, such as LEDs and compact fluorescents/fluorescent tubes. Why is it so unhealthy? Artificial lighting lacks many of the sun’s frequencies that our bodies and brains need but emit about 5 times the blue light we’re used to. They amplify blue light beyond what humans have evolved to handle. Learn how to stop junk light in your home and at your office.
Kelvin TemperatureA temperature scale that is often used to describe the “color temperature” of a lamp. An old-fashioned incandescent bulb, which puts out yellowish light, has a color temperature of about 3,000 K. Put another way, this means its yellowish spectrum closely resembles what a hot object at a 3,000 K temperature would naturally radiate. A lamp with a color temperature of 5,000 K to 5,600 K, which contains more blue light, is typically labeled “daylight” or “full spectrum” because the temperature of the surface of the sun is about 5,800 K. Many newly available LED lights fall within this range or go even higher. (NIST)
LED LightingShort for light-emitting diode, an LED bulb emits visible light when an electrical current passes through it. Over the past decade, the use of LEDs has skyrocketed for both residential and commercial applications because of their energy efficiency. LEDs notably use up to 85% less energy than traditional bulbs and can last for up to 25 years, without some of the drawbacks of other types of light sources. Still, LEDs can pose as potential health hazards. These types of light bulbs lack many of the sun’s frequencies that our bodies and brains need but emit about 5 times the blue light we’re used to. They amplify blue light beyond what humans have evolved to handle. If you're looking for a healthy lighting solution for your home, please look for circadian lighting options.
LensA part of your eye, located directly behind the iris and the pupil, that is composed of transparent, flexible tissue. It works with your cornea to help focus light and images on the retina in your eye.
Light FlickerRefers to rapid, repeating changes in the brightness of light -- light that appears to be fluttering unsteadily. It is caused when the voltage supplied to a light source changes or when the power line voltage itself fluctuates. It can be a result of faulty wiring connections, worn-out receptacles, contact problems, or a bad filament -- all of which are more likely to happen as bulbs age. It's important to note that humans can't always see light flicker, depending on how severe the flicker rate is. Studies have shown that light flicker - whether you can see it or not -- can cause eye strain and headaches.
Light SpectrumSee Electromagnetic Spectrum.
Light TherapyAlso known as photobiomodulation, phototherapy, or LLLT, this a painless, non-invasive form of treatment that uses specific wavelengths of light to help heal the skin and body. Different wavelengths notably have different purposes. This form of treatment was initially developed as a NASA technology, but has since become much more popular and affordable over the past decade. Studies have shown that 580nm (yellow light) has a shallow penetration level and is therefore appropriate for healing the surface of your skin -- think: scars, wrinkles, redness, inflammation, bruising. Wavelenghts 630nm and 660nm (red light), and 850nm (near-infrared light) have deeper penetration levels; these are ideal for healing your body all the way down to the bone -- think: muscle soreness or pain, post-surgery recovery, improved blood circulation. Learn more about light, light therapy, and your health here.
LumensA unit of measurement for the brightness of light in all directions. It is important for knowing how much light a single light source emits. One lumen per square meter is equal to one lux.
LuxThink of this as the "light per area". It is the basic unit of illuminance, which measures the total amount of light that falls on a particular surface. The total measurement can be the result of multiple light bulbs and even daylight mixed in.
Lymphatic SystemA network of tissues and organs that help rid the body of toxins, waste and other unwanted materials. The primary function of the lymphatic system is to transport lymph, a fluid containing infection-fighting white blood cells, throughout the body. (Live Science)
Macula (of the Retina)The light-sensitive layer of tissue lining the interior of the back of the eye.
Macular DegenerationAlso known as age-related macular degeneration (AMD). This is a degenerative eye condition that progressively destroys the macula, the central portion of the retina, and impaires central vision. This condition is considered the leading cause of blindness.
MelanopsinA type of photopigment that (in humans) is found in the retinal ganglion cells (ipRGCs) of the eye. These photoreceptors absorb light and send signals the brain -- basically, they help tell your body what time of day it is depending on how much external light is being perceived. This helps keep your body's natural sleep/wake cycle synchronized with the rise and fall of the sun. Note: ipRGCs are very sensitive to short wavelengths of light, specifically blue light. If you are constantly exposed to artificial light sources, then the cells in your eyes may not be accurately perceiving what time of day (or night) it is. This can affect your energy levels, mood, ability to sleep, and more.
Melatonin (Hormone)A hormone that is naturally produced by the pineal gland in the brain, and is intimately involved in regulating they body's master clock (see circadian rhythm). This hormone is the key ingredient that your body needs in order to fall and stay asleep at night. As the sun descends below the horizon during the evening, your melatonin levels should naturally begin to increase; and when the sun comes back up again in the morning, your melatonin levels should conversely decrease again. This hormone also plays a role in the body’s antioxidant defenses and helps regulate blood pressure, body temperature and cortisol levels, as well as sexual and immune function (NCBI).
Melatonin (supplements)Though the human body is designed to produce melatonin naturally, many people have a difficult falling and staying asleep at night because they are exposed to too much blue light during the daytime. It is a fact that blue light suppresses melatonin levels, and we live in a brightly-lit world that is constantly "on". Melatonin supplements have been developed as a sleep-aid to mimic the natural hormone and induce rest. These may be used to help people with certain sleep disorders, including insomnia, jet lag, and sleep problems related to shift work. Note: Melatonin use among adults in the United States more than doubled between 2007 and 2012 (NIH). Short term use of this sleep-aid is generally safe, but it's best to consult with your doctor.
MicrosecondA unit of time equal to one millionth of a second (or one 1000th of a millisecond, or 1000 nanoseconds). These units of very fine time measurement are typically used in technology devices.
MitochondriaCommonly known as the powerhouse of the cells in your body, mitochondria turn energy (ATP) into food and produce chemicals that help remove toxins from your cells to help keep you healthy.
MyoglobinAn oxygen-binding protein located primarily in muscles. It serves as a local oxygen reservoir that can temporarily provide oxygen when blood oxygen delivery is insufficient during periods of intense muscular activity (ScienceDirect).
Muscle TissueSoft tissue in the body composed of cells that have the ability to shorten or contract in order to produce movement of the body parts. Muscle tissue can be categorized into 3 different categories: skeletal muscle tissue, smooth muscle tissue, and cardiac muscle tissue. (NIH). Each type of muscle tissue in the human body has a unique structure and a specific role: - Skeletal muscle is composed of long cells (muscle fibers) that have a striated appearance. It moves bones and other structures by contracting and relaxing in response to voluntary messages from the nervous system. - Smooth muscle tissue is found in the walls of organs throughout the body (like the stomach and bladder) and provides elasticity, which allows these organs to expand and relax as needed to help facilitate bodily functions. - Cardiac muscle is specifically located in the heart's wall, it contracts the help the heart beat and pump blood.
Nanometer (NM)A unit of measurement used to measure length -- especially that of microscopic objects, such as atomic structures or light wavelengths.
Natural LightNatural light may refer tod daylight, sunlight, or moonlight. When we talk about getting "natural light" during the day, what we mean is that you should try to get at least 30 minutes of exposure to the sun every single day to help regulate your natural circadian rhythm.
Near-Infrared (NIR) Light TherapySimilar to red light therapy, except infrared energy is invisible to the human eye, and it penetrates the body deeper than red — reaching deep into soft tissues, muscles, joints, and bone. Since their wavelengths have deep penetration levels into the body, NIR can help stimulate cellular energy metabolism and increase energy production. Wavelengths 850nm and 880nm are thought to be the most effective within the NIR spectrum, and they can be used to help heal a variety of health conditions.
Nitric OxideA key molecule in the cardiovascular system which helps keep blood vessels healthy and regulate blood pressure. Nitric Oxide has also been found to be essential to the immune system and to the nervous system (including the brain) as well as integral with many chronic health conditions and diseases, such as chronic inflammation, erectile dysfunction, and cancer. This has led researchers to focus on nitric oxide as a potential target for medical therapies. A series of metabolic events occur with the releasing of nitric oxide when a light therapy device, such as TrueLight™ emits 630nm, 660nm, and 850nm light wavelengths, which are easily absorbed by hemoglobin in the bloodstream and other body tissue. This release of nitric oxide dilates blood vessels and allows for greater cellular energy production. The result is in increased cellular activity that can promote healing, muscle recovery, and tissue strengthening.
NonbenzodiazepinesAlso known as "Z-drugs", this is a class of psychoactive drugs that are benzodiazepine-like in nature; however, they are structurally different on a molecular level. Dependence and addiction are not as common with these drugs compared to benzodiazepines, but they can still occur. Examples include: Lunesta, Ambien, and Sonata.
Nose PadsSmall, usually oval-shaped pieces of material that sit along the bridge of your nose to prevent slippage, and that protect your nose from the frame of your glasses.
OpticianA specialist who who designs, fits and dispenses corrective lenses for the correction of a person's vision.
OphthalmologistA physician (doctor) who specializes in the medical and surgical care of the eyes and visual system and in the prevention of eye disease and injury (Harvard).
Orange LightOrange is the color between yellow and red on the spectrum of visible light. Human eyes perceive orange when observing light with a dominant wavelength between 590-620 nm.
PhotobiomodulationSee Light Therapy.
PhotoreceptorsCells in the retina of the eye that are sensitive to light. These cells have rods and cones that convert light signals into information used by the brain to create a visual representation.
Pineal GlandA small, pea-shaped gland in the brain that regulates some hormones, including melatonin, and directly influences sleep patterns.
PolarizationA technique used on eyewear to reduce light glare and improve vision and safety, especially in the sun.
PolycarbonateA light-weight, impact-resistant material that provides nearly 100% UV protection. This is one of the best materials to use for eyeglasses and sunglasses.
Power DensityThe amount of power in a given mass. It also describes the rate at which its energy within a system can be exhausted. If a system has a high power density, than it can output large amounts of energy based on its mass. Conversely, an object with a high energy density, but low power density can perform work for a relatively long period of time. For example, the power found in a mobile phone will last most of the day, but to recharge the device, it must be connected to another power source for an hour or more. (ResearchGate)
Prescription LensesEyewear with an individual corrective prescription built into the lenses. The prescription itself is written by an optometrist or ophthalmologist.
ProgressivesLenses in eyeglasses thathelp you see clearly at all distances without those pesky (and age-defining) lines that are visible in regular bifocals and trifocals.
Pulse ModeOne of the available modes in any of our TrueLight light therapy devices to help manage pain. It has been discovered that when specific frequencies of LED lights are pulsed, body tissue can heal more rapidly. When it is given a continuous burst, it sedates the cell and relieves the pain.
PupilThe opening in the center of the iris (the structure that gives our eyes their color). When light enters the pupil of the eye, it's absorbed by the retina to begin the process of sight.
Pupillary DistanceAlso known as interpupillary distance (IPD), this is the distance measured in millimeters between the centers of the pupils of the eyes. Because everyone's face is different, this measurement can be pretty important when choosing your next pair of frames.
Reading GlassesGlasses that improve the ability to read something up close, such as a book or a computer screen. They may be available over-the-counter or as prescriptions.
Red LightRed (625-740 nm) is the color at the end of the visible spectrum of light, next to orange and opposite violet. Studies show that red light can be extremely effective for healing the body -- from the the surface of your skin all the way down to the bone. Specifically, 630nm and 660nm affect bodily cells on a biochemical level by increasing mitochondrial function – the ability to produce cellular energy. The more cellular energy production, the better the body functions as a whole.
Red Light TherapyA form of light therapy that works from the inside-out to enhance mitochondrial function in cells. When red light wavelengths are used on the skin’s surface, they can penetrate 8-10 millimeters into the skin. This, in turn, can have several benefits, including but not limited to: increased muscle recovery
enhanced blood circulation
increased collagen production
reduced scars, wrinkles, & fine lines
faster wound healing
less pain
anti-inflammatory effects
Refraction (of Light)The bending of light as it passes from one transparent substance into another. Thanks to refraction, we're able to use lenses and magnifying glasses, and see pretty rainbows. 🙂
RetinaThe sensory membrane that lines the back of the eye, senses light, and sends pictures of what the eye sees to the brain.
RNAAbbreviation for ribonucleic acid, it plays important roles in both normal cellular processes and diseases.The three most well-known and most commonly studied are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA), which are present in all organisms. More specifically, mRNA carries the protein blueprint from a cell's DNA to its ribosomes, which are the "machines" that drive protein synthesis. tRNA then carries the appropriate amino acids into the ribosome for inclusion in the new protein. Meanwhile, the ribosomes themselves consist largely of ribosomal RNA (rRNA) molecules. (Nature)
RodsPhotoreceptor cells in the retina of the eye that are responsible for vision at low light levels.
RosaceaA chronic, inflammatory skin condition that most often affects the face -- specifically with redness, swelling, and visible blood vessels. There is currently no cure, but light therapy can be used to help minimize symptoms.
Seasonal Affective Disorder (SAD)A type of depression that comes and goes with changing seasons -- especially during the winter months when it is typically colder and darker outside. This condition usually occurs more frequently in people who live far north or south of the equator because they don't get as much natural sunlight. Some studies have indicated that people who suffer from SAD often don't produce enough serotonin or vitamin D, and they produce too much melatonin. Light therapy may be an appropriate means to treat SAD; however, SAD lights are not the same thing as low level laser therapy devices that penetrate the body for deeper healing.
SerotoninAn important chemical and neurotransmitter in the human body that helps with mood regulation, perception of pain, as well as hunger and satiety, and other physical functions.
Shift WorkWork that takes place outside of the traditional eight-hour schedule (9 am – 5 pm). This may include night shifts, early morning shifts, and/or rotating shifts that cause a person to shift their natural sleep/wake cycle around their work schedule. According to the International Labor Organization, it is defined as staying awake 3 or more hours between 10 pm and 5 am for at least 50 days in a year. Shift work often leads to disruption of the body's natural circadian rhythm and sleep patterns, which can then lead to a number of health concerns, including but not limited to: insomnia, weight gain, mood disorders, heart disease, and even cancer.
Shift WorkerEmployees that work outside of the traditional eight-hour schedule (9am-5pm). Many industries today employ shift workers so that the business can keep operating 24/7. Industries and fields include military, first responders, healthcare, restaurants, transportation, convenience stores, customer service call centers, and media. Keep in mind that any facility that houses people 24 hours a day typically keeps the lights on and staff working. This includes venues like hotels, prisons, and nursing homes.
SleepThe body's rest cycle; a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly all voluntary muscles, and reduced interactions with surroundings.
Sleep ApneaA sleep disorder characterized by interrupted breathing during sleep.
Sleep CycleThe progression through the various stages of NREM sleep (stages 1, 2 and 3) to REM sleep before repeating the progression again with NREM sleep. Typically, a person starts a sleep cycle every 90-120 minutes, resulting in four to five cycles in a single night.
Sleep DeprivationAlso known as insufficient sleep or sleeplessness, it occurs when you don't get enough sleep.
Sleep Disorders This refers to problems with the quality, timing and amount of sleep that you're getting each night. Symptoms may include excessive daytime sleepiness, irregular breathing or increased movement during sleep. Sleep disorders can affect your overall health, safety and quality of life.
Sleep-HackingTaking more control over the light in your environment, especially at night, so that you can fall asleep faster and get higher quality rest. This is what our nighttime glasses help you do!
Sleep HygieneHealthy sleep habits and practices that are conducive to helping you get high quality rest each night.
Sleep/wake CycleSee Circadian Rhythm.
Social Jet LagThe discrepancy between 'biological time' and 'external requirements'. The best is example of this when you return to work from vacation or a holiday and feel sluggish after having changed your sleep patterns temporarily. This temporary condition typically only lasts for a few days, but it is associated with worsened health and mood, as well as increased sleepiness and fatigue.
Steady ModeOne of the available modes on any of our TrueLight light therapy devices. It involves the use of a steady light to penetrate and heal the body. When a single-frequency pulsed light hits the cells, it stimulates them to start producing more energy. As a result, the cells heals faster, and your body does too.
Stratum CorneumThe outermost layer of the epidermis within the skin. It serves as the primary barrier between the body and the environment.
TortoiseshellAlso known as “horn-rimmed glasses“, this is a style of frames that mimic the look of real turtles and have a speckled look. Be sure to check out our Daylights Grey Tortoiseshell Pro style!
Transition LensesThis refers to lenses that darken in the sunlight and lighten in softer light or the dark. We currently offer two different styles of transition lenses that block 40% of blue light while indoors and 99% of UVA/UVB rays outside: Daylights Transition Sunglasses Daylights Aviator Transition Sunglasses
Ultraviolet (UV) LightA form of radiation which is not visible to the human eye. Most of the natural UV light people encounter comes from the sun. Our bodies use it to make vitamin D, but too much exposure can cause painful burns and in extreme cases, cancer.
UV-AAlso known as near UV (315–400 nm) radiation.
UB-BAlso known as middle UV (280–315 nm) radiation.
UV-CAlso known as UVC, or far UV (180–280 nm) radiation.
Violet (or Purple) LightViolet is the color at the end of the visible spectrum of light between blue and the invisible ultraviolet. Violet color has a dominant wavelength of approximately 380-450 nm.
Visible LightThe portion of the electromagnetic spectrum that is visible to the human eye. A typical human eye will respond to wavelengths from about 390 to 700 nm.
VisionThis is a relatively general term that refers to a number of visual abilities and skilles -- including the ability to track moving objects with smooth and accurate eye movements, color vision, depth perception, focusing speed and accuracy, and more.
Vitamin DA nutrient that helps your body absorb calcium. You can get Vitamin D in three ways: through your skin, from your diet, and from supplements. Lack of natural sunlight often results in a deficiency in Vitamin D.
WattageAn amount of power, especially electric power, expressed in watts or kilowatts.
WattA unit of power that is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer.
WavelengthThe distance between two peaks in a wave. Different types of light have different wavelengths. The difference in wavelengths is the way we tell different kinds of electromagnetic energy apart.
Winter BluesSee Seasonal Affective Disorder (SAD).
Yellow LightYellow light is also sometimes referred to as amber light therapy. It encompasses the range of wavelengths from 570-620 nm.
ZzzThe thing you do for 7-9 hours every single night so that you can wake up feeling resfreshed to take on the next day and perform your best. If you aren't getting enough Zzz's or enough quality Zzz's, please get in touch with us and we can offer some helpful resources for you!

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