Protect Your Eyes from UV Rays Damage
It is well known that being exposed to the Ultraviolet(UV rays) too much can cause sunburn、suntan，even skin cancer. But do you know that UV can also be harmful to our eyes? Excessive ultraviolet exposure can cause photochemical reactions, which can cause a series of changes in human functions, especially to the human skin, the human eyes and the immune system.
For our eyes, it may cause significant eye problems, including cataracts, macular, degeneration, pingueculae, pterygia, and photokeratitis.
What is UV?
Many people associate ultraviolet radiation with ultraviolet light, but UV rays cannot be seen, so it’s technically incorrect to mix the two terms together.
There are two types of UV radiation: UVA、UVB. Over time, the effects of UV rays may help cause a number of eye problems.
UVA rays are close to visible light rays and have lower energy than UVB rays(see below). They can pass through the cornea and reach the lens and retina inside eyes.
Overexposure to UVA radiation has been linked to the development of certain types of cataracts. It can hurt your central vision. It can damage a part of the retina at the back of your eye. It may cause macular degeneration.
UVB rays have slightly shorter wavelengths (290-320 nm) than UVA rays(320-400nm). These rays are filtered partially by the ozone layer, but some still can reach the Earth's surface.
Overexposure to the sun's UVB radiation also is associated with a number of eye problems, including pingueculae, pterygium, and photokeratitis("snow blindness"). The front part of your eye (the cornea and the lens) absorbs most UV-B rays, but these rays may still cause even more damage to your eyes than UV-A rays.
Why do we need to protect our eyes from UV?
Ultraviolet range from 320-340nm damages lens in maximum extent. It is susceptible to protein absorption generated in the oxidation reaction that occurs cataract. The retina has a high sensitivity to UV at 350nm or so, which can cause retinal pigment epithelial aging and senile macular degeneration by chemical reaction, especially for aphakic eyes after cataract surgery, because the amount of ultraviolet reaching the retina can reach about 60%, it is prone to age-related macular degeneration.
How to protect your eyes from UV?
To protect your eyes from harmful solar radiation, wearing sunglasses that block 100 percent UV whenever you are outdoors in daylight is a wise choice. The sun's damaging UV rays can penetrate cloud cover, so your eyes need protection even on cloudy days.
Tips on protecting your eyes from the sun's harmful rays :
- Always wear sunglasses when you are outdoors, the lens’ color such as grey, amber, green, and yellow are better in protecting your eyes.
- The amount of UV protection sunglasses provide is related to the color and darkness of the lenses.
- Wear anti-blue glasses, all the VlookOptical anti-blue lenses are UV400 protection levels.
- Besides, wearing a wide-brimmed hat which can shield your eyes on sunny days can reduce your eyes' exposure to UV by up to 50 percent.
- Remember to wear sunglasses even when you're in the shade. Although shade reduces your UV exposure to some degree, your eyes still will be exposed to UV rays reflected from buildings, roadways, and other surfaces.
How to Order UV protective lens on VlookOptical?
Step1: Enter the VlookOptical website vlookoptical.com, select the frame you like, and click on “ADD LENSES”.
Step2: Go to the following page, select the desired lenses type, and fill in the personal information according to the hospital optometry results.
Step3: Choose lens functions such as ordinary aspherical lenses, myopia sunglasses, color-changing lenses, and anti-blue lenses.
Step 4: For example, choose myopia sunglasses, enter the lens tint selection, we offer three processes: solid color, gradient color, and mirror color, each type has 7 colors, solid color tint sunglasses have light, medium and dark tint, choose the type you like.
Step 5: Select the desired lenses refractive index (affects the lens thickness) and finally submit the order and check out.