Blue light

Screen filter

Background

Visible light, including light emitted from your phone screen is much more complex than you might think. Staying in the sun, turning on your computer, phone or other digital device, or simply the light in the room result in your eyes being exposed to a variety of visible (and sometimes invisible) light rays that can have a range of effects, both positive and negative.

You are probably aware that sunlight contains visible light rays and also invisible ultraviolet rays that can affect the skin. However, what you may not know is that the visible light emitted by the sun is in a range of light rays of different color that contain different amounts of energy. 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. This is more widely known as electromagnetic radiation. The sunlight is created from this combination of rays.

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.

They 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.

Too much exposure to UV is damaging to the skin. It can cause a painful sunburn and even worse, can lead to skin cancer. These rays also can cause sunburned eyes a condition called snow blindness. But ultraviolet radiation, in moderation, also has beneficial effects, such as helping the body produce sufficient amounts of vitamin D.

Blue light contributes to digital eye strain; computer glasses that block blue light may increase comfort.

High-energy blue light yields more energy and can pass straight through your eye. Frequent and uncontrolled screen use at night can result in damage to eyes, ranging from eye strain to myopia (nearsightedness) and macular degeneration. Use blue light filter as a means of eye care to achieve better eye health.

Blue light from screen displays may cause headaches, and sleep disorders. Children are more vulnerable to eye damage because their crystalline lens is less effective in filtering out blue light, adding to the risk of age-related macular degeneration.

Blue light hinders the normal production of melatonin, the hormone responsible for regulating wake and sleep cycles. This results in longer wake times, and sometimes insomnia.

Key Points About Blue Light

1. 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 screens of your favorite smart watch, smartphone and TV. These are sources of extensive blue light emissions. 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.

2. HEV light rays make the sky look blue.

Blue Light rays scatter more easily than other visible light rays when they strike air and water molecules in the atmosphere. The higher degree of scattering of these rays is what makes a cloudless sky look blue.

3. The eye is not very good at blocking blue light.

Virtually all visible blue light passes through the cornea and lens and reaches the retina. Thus, the eye in not very protected against damaging blue light.

4. Blue light exposure may increase the risk of macular degeneration.

The fact that blue light penetrates all the way to the retina and can damage its light-sensitive cells. This causes changes that resemble those of macular degeneration, which can lead to permanent vision loss.

5. Blue light contributes to digital eye strain.

Blue light scatters more easily than other visible light and, therefore, 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 rays reduce 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 with yellow-tinted lenses may increase comfort if you use screens for extensive periods of time.

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

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.

7. Not all blue light is bad.

It's been scientifically documented and proved that some blue light exposure is essential for good health. Research has shown that high-energy visible light boosts alertness, helps memory and cognitive function and elevates mood.

Blue Light Filters

Apps filtering blue light have been created to reduce the emission of damaging rays especially in later hours of the day. Our Screen Filter ensures the following benefits:

More information

Issues you can deal with using Screen Filter:

  • eye strain and fatigue
  • insomnia
  • dark circles around eyes