How to test a sunglasses for UV protection?
September 7, 2008 2:13am CST
Nowdays we can get cheap and fashionable sunglasses everywhere. But having UV protection for a sunglasses is very important for our eyes. There are some cheap sunglasses that has label on it saying it has UV protection. But how can we test to see if it really does have UV protection?
7 Sep 08
Well technically there are three types of UV'z in the atmosphere, the UV, Uv-c which is blocked by the atmosphere and UV-B which is blocked with the glass or fibre of the lense of the sunglass, but UV-A passes through to your eyes! Now do one thing take a UV-A light source (basicallly available in market) and a UV test paper! this test paper looks like a DOT on it where you have to emit the UV-A light on it when it falls it'll turns pink /purple now take the light source and emit it on the dot on the page! it'll glow purple/pink now obstacle it with your sunglass and see if the light passes to turn it pink/purple or no! if the intensity is low then be happy for your sunglass is a UV-A protector sunglass and works nice!