Why do some sunglasses say they protect 99% UV while others say 100%? Is there a real difference?

Question

My daughter has purchased 99% UV sunglasses, while mine are 100%. I don't want her eyes hurt because these sunglasses don't do the job.

Answer 1

As long as your sunglasses are labeled stating your lenses will protect from 99% to 100% of both UVA and UVB light. This can also be labeled as "UV 400” which blocks all light rays with wavelengths up to 400 nanometers. (This covers all of UVA and UVB rays.) As long as your sunglasses have one of those labels they will provide enough protection



If you are ever unsure of the UV protection that your sunglasses provide, most opticals have UV meters that read the amount UV light that is passing through your lenses. That way you can be certain they are providing protection to your eyes.



Full UV protection is very important because UV exposure is known to cause photokeratitis, early onset of cataracts, macular degeneration and growths like pterygium and p

Just like our skin needs protection from UV rays, our eyes do as well!

Hope this helps a bit :)

As long as your sunglasses are labelled tha they will protect from 99% to 100% of both UVA and UVB light. This can also be labelled as "UV 400" which blocks all light rays with wavelengths up to 400 nanometers. (This covers all of UVA and UVB rays.) As long as your sunglasses have one of those labels they will provide enough protection



If you are ever unsure of the UV protection that your sunglasses provide, most opticals have UV meters that read the amount UV light that is passing through your lenses. That way you can be certain they are providing protection to your eyes.



Full UV protection is very important because UV exposure is known to cause photokeratitis, early onset of cataracts, macular degeneration and growths like pterygium and pinguecula.

Just like our skin needs protection from UV rays, our eyes do as well! It is great to see your concern for your daughters eye health, It is always important to protect our children and ourselves alike from UV rays :)

Hope this helps a bit :)

Answer 2

A pair of sunglasses seems so simple -- it's two pieces of tinted glass or plastic in some sort of plastic or metal frame. How much more straightforward can something get? It turns out that there are many different things you can do with two pieces of glass, and these things can have a big effect on you when you use the lenses. As you will see in this article, there really is a difference between the various sunglasses you'll find out there. There are four things that a good pair of sunglasses should do for you: Sunglasses provide protection from ultraviolet rays in sunlight. Ultraviolet (UV) light damages the cornea and the retina. Good sunglasses can eliminate UV rays completely. Sunglasses provide protection from intense light. When the eye receives too much light, it naturally closes the iris. Once it has closed the iris as far as it can, the next step is squinting. If there is still too much light, as there can be when sunlight is reflecting off of snow, the result is damage to the retina. Good sunglasses can block light entering the eyes by as much as 97 percent to avoid damage. Sunglasses provide protection from glare. Certain surfaces, such as water, can reflect a great deal of light, and the bright spots can be distracting or can hide objects. Good sunglasses can completely eliminate this kind of glare using polarization (we'll discuss polarization later). Sunglasses eliminate specific frequencies of light. Certain frequencies of light can blur vision, and others can enhance contrast. Choosing the right color for your sunglasses lets them work better in specific situations. When you buy a pair of cheap sunglasses, you often give up all of these benefits and can even make things worse. For example, if your sunglasses offer no UV protection, you increase your exposure to UV rays. The cheap sunglasses block some of the light, causing your iris to open to allow more light in. This lets in more of the UV light as well, increasing the damage UV light can cause to the retina.

Answer 3

It's just poor advertising. Any sunglesses with 95% of UV protection and up will be fine. But you still shouldn't look directly at the sun even with sunglasses.

Answer 4

1% of UV doesn't hurt her eyes. I know this since I don't use sunglasses. ;)



And consider this:

99.6% =~ 100%

99.4% =~ 99%

Answer 5

There probably isn't any difference in the two other than the stickers .

Answer 6

I kinda doubt there's a diffrence... probably advertising

Answer 7

i wouldn't worry about it-it sounds like advertising tricks.