There are three types of UV (ultra-violet) beams. UVC is blocked by the ozone layer, and so will not be discussed within this article.
It is highly advised to select eyewear that will block both UVA and UVB. These glasses are labeled UV 400.
Fight the desire to purchase cheap sunglasses. They typically only block approximately 65% of UV rays. Furthermore, they are created using less-than-optimal high quality lenses which could incorporate distortion. This, then, can result in eye strain and possibly headaches.
It’s crucial that you understand that ultraviolet can go right through clouds. Therefore, it is advised to wear UV protection even if it is not a clear sunny day.
Children and teens should also wear sunglasses if not in college (Schools often frown upon children wearing sunglasses, even if it’s simply outside during recess). Their eyes are still growing, which makes them even more vulnerable to UV damage.
These rays are condensed by the cornea onto the nasal conjunctiva, relieving pinguecula (yellow bump on the white of the eye), which may result in pterygium formation over time. A pterygium is defined as the conjunctiva growing within the retina.
Protect your eyes: Polycarbonate lenses. This type of lens includes an integrated UV-blocker, which prevents 99 percent of UV rays from moving through. As it’s a clear lens, light will still be quite bright. Additionally, this lens doesn’t block UV rays coming in the sides. UV-blocking lenses. Lenses, made vinyl are coated with a UV blocker. They keep a very slight yellowish shade after the coating process. What’s more, they never block UV rays coming from the sides.
- Clip-ons. They have to be mounted on regular glasses each time UV could be present. Clip-ons are therefore only useful to people already wearing eyeglasses. They’ll block both UV and light. But they don’t block UV rays coming in the sides.
- Fit-overs. This option is also only for people already wearing eyeglasses. Aside from the fact that they do not have to be mounted on eyeglasses, they are very much like clip-ons. The main difference is that they block UV rays coming from the sides in addition to from directly in front. Transitions. These lenses move from clear to dark in the presence of all UV rays. It is another alternative useful only to those who need prescription glasses. The main drawbacks are that they do not block UV rays coming in the sides, and that the lenses do not get very dark inside automobiles. This is a result of how the windshield blocks the majority of the UV beams needed to make the lenses alter color. This is the best option. Especially the wrap-around designs which block UV rays from each direction.
Polarized eyewear does not block more UV rays, but eliminates glare, to get a far more comfortable experience. Polarized lenses are offered for options 3,4 and 6.
UV rays aren’t the sole cause of cataracts, macular degeneration, pinguecula and pterygium.
By way of example, macular degeneration may also be attributed to tobacco. A pterygium could result from wind or dust.
Consequently, wearing UV-blocking eyewear might not be adequate in preventing these eye diseases, but it will surely slow them down.