Natural white light is made up of red, orange, yellow, green, blue, indigo, and violet light. Each of these colors use a different wavelength, and carry different energy levels. The shorter the wavelength, the greater the energy, with blue, indigo, and violet light being the most energetic. Blue Free Optical daytime lenses use patented technology to block 100% of blue spectrum light up to the range at which blue light is harmful to humans — 455nm during the day, and up to 550nm in the evening (when we’re most susceptible to blue-light).

Blue light is extremely prevalent in many modern technologies. These include:

• Fluorescent light
• CFL (compact fluorescent light) bulbs
• LED light
• Flat screen LED televisions
• Computer monitors, smart phones, and tablet screens

Blue Free Optical lenses are designed to be comfortably worn when using digital screens and non-natural lighting, protecting your eyes from the harmful blue light these technologies produce.

High energy blue light impacts photoreceptor cells in your eyes and suppresses the natural production of the sleep hormone melatonin, which throws off your body’s internal clock. This makes it more difficult to achieve deep, restful sleep. Blue light also emits a unique glare that impacts your retina, causing eye strain, headaches, and physical and mental fatigue. Blue light may contribute to a range of chronic health conditions, including but not limited to:

• Eye strain
• Headaches/migraines
• Short-term memory loss
• Problems sleeping (due to melatonin suppression)
• Stress and anxiety (due to cortisol suppression)
• Symptoms of Seasonal Affective Disorder or depression
• Endocrine disruption
• Reduced immune system functionality
• Female hormonal/menstrual cycle disruption
• Weight issues
• Anxiety

Blue Free Optical lenses protect wearers from the negative side-effects of blue light exposure.

Yes. The human body relies on an extremely sensitive internal clock that regulates when we should be asleep and when we should be awake. These are called circadian rhythms. During the night, circadian rhythms indicate to the body that it should be entering a deep sleep, increasing melatonin production, repairing cell damage, and performing other essential functions that cannot occur effectively while the body is awake.

Studies have shown that the human body relies on external indicators to set its natural sleep cycle, and that by exposing it to high energy blue light, we disrupt circadian rhythms and slow our production of melatonin. This leads not only to poor, less restful sleep, but also to a range of other health issues associated with reduced melatonin production.

Blue light glasses (also called blue light blocking glasses and blue light filter glasses) are lenses that are designed to reduce the amount of blue light that reaches your eyes. By filtering out harmful blue light, while allowing non-damaging wavelengths to pass through, these lenses help ensure improved blue light protection, without impairing the user’s vision. Blue Free Optical lenses provide the only comprehensive blue light blocking currently available. Our daytime lenses filter out 100% of dangerous blue light up to the 455nm range, and our nighttime lenses expand that coverage to the 550nm range, preventing symptoms of blue light exposure and eliminating the risk of melatonin suppression at any time of day.

Blue light glasses (also called blue light blocking glasses and blue light filter glasses) are lenses that are designed to reduce the amount of blue light that reaches your eyes. By filtering out harmful blue light, while allowing non-damaging wavelengths to pass through, these lenses help ensure improved blue light protection, without impairing the user’s vision. Blue Free Optical lenses provide the only comprehensive blue light blocking currently available. Our daytime lenses filter out 100% of dangerous blue light up to the 455nm range, and our nighttime lenses expand that coverage to the 550nm range, preventing symptoms of blue light exposure and eliminating the risk of melatonin suppression at any time of day.

Simply wear the Blue Free Optical day lenses as you would any other glasses. Keep them on throughout your day, particularly when you are using digital devices or under fluorescent lighting. Our day lenses reduce the most damaging blue light emission, eliminating 100% of dangerous blue spectrum light. This reduction balances out the color spectrum found in artificial lighting, protecting your eyesight and light-driven hormones, such as cortisol and melatonin, from damage.

When the sun sets, put on your Blue Free Optical night glasses. For best results wear them consistently from sunset until you go to bed. Even brief exposure to artificial lighting can disrupt our internal clock; if you get up at night and use light, be sure to wear your glasses or change the lighting in your house to utilize only natural light during the day, and red incandescent bulbs at night. If you wake before sunrise, be sure to wear your night glasses until the sun is up.

Blue Free Optical glasses are essential for anyone whose work incorporates digital screen technology, or who spends large amounts of time under fluorescent or compact fluorescent lighting. Additionally, anyone who spends more than a few hours a day in recreational screen time should consider investing in Blue Free Optical tinted lenses, particularly if they are using screens in the evening or at night.

Children and young adults are also extremely susceptible to the damage caused by blue light, and are more likely to overuse digital screen technologies. As such, they also benefit from Blue Free Optical lenses.

Blue Free Optical standard blue light glasses have no magnification to the lenses, and do not require a prescription. However, prescription lenses are available.

Blue Free Optical lenses are designed to block only harmful blue light, giving you optimal color vision through the rest of the spectrum. Additionally, as your eyes adjust to wearing the glasses, you’ll automatically begin to compensate for the colored lenses. This means that the more you wear Blue Free Optical lenses, the less they’ll affect your color perception.

In a 2009 study, researchers investigated whether wearing blue light blocking glasses three hours before sleep would help insomniacs who had difficulty falling asleep or maintaining sleep. They compared amber glasses that completely blocked wavelengths < 525 nm and around 50% at 550 nm with clear glasses that only blocked UV light. Participants completed sleep diaries for one week before wearing the glasses and for two weeks while they were wearing the glasses. The group wearing the blue-blockers experienced significantly improved sleep and mood.

In a 2017 study, researchers had insomniacs wear either amber-colored glasses that filter about 65% of blue light or clear glasses for two hours before bedtime. In this study, all participants had to undergo both conditions. In a questionnaire preceding the experiment, participants reported unrefreshing sleep, difficulty staying asleep, difficulty falling asleep, and frequent awakenings. While glasses were off during sleep, the participants were instructed to put them on before using any light or electronic device at night. Total sleep time and sleep quality were significantly improved when participants wore amber glasses.

In both studies, results suggested that wearing blue light glasses at night can drastically improve sleep quality. Blue Free Optical lenses provide the only complete day and night blue light protection, for better sleep and improved health.

The science behind blue light and its effects on your body is well-established. The following is a non-comprehensive list of studies demonstrating the negative effects of blue light.

• Blue-Light Filtering Spectacle Lenses: Optical and Clinical Performances
• Melanopsin Regulates Both Sleep-Promoting and Arousal-Promoting Responses to Light
• Artificial Outdoor Nighttime Lights Associate with Altered Sleep Behavior in the American General Population
• How Light Affects Our Sleep
• Measuring and using light in the melanopsin age
• Morning and Evening Blue-Enriched Light Exposure Alters Metabolic Function in Normal Weight Adults
• Spectral responses of the human circadian system depend on the irradiance and duration of exposure to light
• Green light attenuates melatonin output and sleepiness during sleep deprivation
• Extent and Health Consequences of Chronic Sleep Loss and Sleep Disorders
• Circadian Rhythm and Human Health
• Light-at-night-induced circadian disruption, cancer and aging
• Blue-blocking Glasses To Improve Sleep And ADHD Symptoms Developed
• Artificial light at night could increase the risk of type 2 diabetes and other diseases
• Circadian Rhythm Disturbances in Patients with Alzheimer's Disease: A Review
• Sleep and circadian rhythm disruption in psychiatric and neurodegenerative disease