What is blue light?

Answer: Sunlight contains red, orange, yellow, green and blue light rays and many shades of each of these colors, depending on the energy and wavelength of the individual rays (also called electromagnetic radiation). Combined, this spectrum of colored light rays creates what we call "white light" or sunlight.

Chart showing where on the light spectrum fall other visible light, blue light and ultraviolet light.

Without getting into complicated physics, there is an inverse relationship between the wavelength of light rays and the amount of energy they contain. Light rays that have relatively long wavelengths contain less energy, and those with short wavelengths have more energy.

Rays on the red end of the visible light spectrum have longer wavelengths and, therefore, less energy. Rays on the blue end of the spectrum have shorter wavelengths and more energy.

The electromagnetic rays just beyond the red end of the visible light spectrum are called infrared — they are warming, but invisible. (The "warming lamps" you see keeping food warm at your local eatery emit infrared radiation. But these lamps also emit visible red light so people know they are on! The same is true for other types of heat lamps.)

On the other end of the visible light spectrum, blue light rays with the shortest wavelengths (and highest energy) are sometimes called blue-violet or violet light. This is why the invisible electromagnetic rays just beyond the visible light spectrum are called ultraviolet (UV) radiation.

Visible blue light is also called "high-energy visible" (HEV) blue light. Like ultraviolet radiation, visible blue light (HEV blue light) — the portion of the visible light spectrum with the shortest wavelengths and highest energy — has both benefits and dangers. 

Blue light is everywhere.

Sunlight is the main source of blue light, and being outdoors during daylight is where most of us get most of our exposure to it. But there are also many man-made, indoor sources of blue light, including fluorescent and LED lighting and flat-screen televisions.

Most notably, the display screens of computers, electronic notebooks, smartphones and other digital devices emit significant amounts of blue light. The amount of HEV light these devices emit is only a fraction of that emitted by the sun. But the amount of time people spend using these devices and the proximity of these screens to the user's face have many eye doctors and other health care professionals concerned about possible long-term effects of blue light on eye health.

Why is blue light bad for me?

Answer: Virtually all visible blue light passes through the cornea and lens and reaches the retina.

Blue light exposure may increase the risk of macular degeneration.

The fact that blue light penetrates all the way to the retina (the inner lining of the back of the eye) is important, because laboratory studies have shown that too much exposure to blue light can damage light-sensitive cells in the retina. This causes changes that resemble those of macular degeneration, which can lead to permanent vision loss.

Although more research is needed to determine how much natural and man-made blue light is "too much blue light" for the retina, many eye care providers are concerned that the added blue light exposure from computer screens, smartphones and other digital devices might increase a person's risk of macular degeneration later in life.

Blue light contributes to digital eye strain, tired eyes and blurry vision.

Because short-wavelength, high energy blue light scatters more easily than other visible light, it is not as easily focused. When you're looking at computer screens and other digital devices that emit significant amounts of blue light, this unfocused visual "noise" reduces contrast and can contribute to digital eye strain.

Research has shown that lenses that block blue light with wavelengths less than 450 nm (blue-violet light) increase contrast significantly. Therefore, computer glasses that block blue light may increase comfort when you're viewing digital devices for extended periods of time.

Blue light contributes to sleeplessness and poor sleep quality.

Too much blue light blocks your sleep hormone melatonin, disrupts your circadian rhythm, and lowers the quality of your health.

By wearing Cryptorays, you block the blue light and protect your eyes while you're on your computer and phone. This helps you reduce digital eye strain, improve your focus, and have higher quality sleep.

Blue light protection may be even more important after cataract surgery.

The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well — the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.

If you have cataracts and are about to have cataract surgery, ask your surgeon what type of intraocular lens (IOL) will be used to replace your cloudy natural lens, and how much blue light protection the IOL provides. After cataract surgery you might benefit from eyeglasses that have lenses with a special blue light filter — especially if you spend long hours in front of a computer screen or using other digital devices.

What's the difference between the "DAY" and "NIGHT" versions of the glasses?

Answer: Blue light is part of the sun's natural light spectrum. Humans have millions of light receptors, most of which are concentrated in the eyes, to react to different wavelengths. Because we are diurnal creatures, when blue light hits our light receptors, it suppresses the production of melatonin, our sleep-promoting hormone.

Before electronics, we were only exposed to blue light during the daytime when the sun was up. When the sun would go down, that would signal our body to prepare for sleep. To align yourself with your natural circadian rhythm, blue light exposure should be limited as much as possible at night.

Nighttime Cryptorays with orange tinted lenses block close to 100% of blue light between 400-500nm and are designed primarily for wearing in the hours before bedtime to improve sleep and prevent blue light related sleep problems.

The Day Cryptorays with almost-clear lens are specifically designed for screen-time during the day. They block up to 50% of blue light between 400-450nm, which studies are have shown is the most harmful part of the blue light spectrum. Just like the Nighttime Cryptorays, they also help to prevent eye strain and sore eyes. The difference is that the Daytime Cryptorays allow some of the blue light between 450-500nm to get through, because blue light exposure during the day important to give your body the signals that it is daytime and that it should be awake.

Blue light during the daytime can also help with alertness, memory and cognitive function. The Cryptolete Day Glasses give you these benefits while protecting your eyes from the harmful blue light.

By allowing exposure to the good blue light during the day, and limiting all blue light at night, your body will get the appropriate signals to help regulate its sleep/wake cycle and help you get the best out of both your sleeping and waking hours. 

Can you use these with contact lenses?

It is perfectly fine to use Cryptorays with your contact lenses.

Can you wear them outside during the day?

Yes! Cryptorays are UV protected. Many people wear Cryptorays in place of sunglasses.

Can I wear these glasses over reading glasses?

You can, but it might be a little uncomfortable to wear two pairs of glasses at one time. Currently we don't have any fitovers.

Do these come with instructions about the best way to use them to get better quality sleep?

We recommend wearing Cryptorays any time you are using digital devices such as phones, tablets, computers, or TVs for extended periods. This will prevent digital eye strain. We strongly recommend wearing your Cryptorays at least one hour before bedtime to stop artificial blue light disrupting your sleep. Some customers report better results putting the glasses on even earlier before bed.

Experience relaxed eyes and better sleep today!

Do you offer refunds or exchanges?

Answer: Yes! We offer a 100% satisfaction guarantee. If for any reason you want to return your glasses, just shoot us an email within 7 days of receiving your glasses and we will provide you a full refund upon receiving your glasses.