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Item specifics
Product Description
Please Confirm Before Purchase , Don't buy mistakes!!
"+" Means: Magnifying Glasses/Hyperopia/Prebyopia/Farsightedness , for old man look near "-" Means: Myopia/Short-short/Vision Miuns , for students look far
For example : if you need presbyopia +2.5 , please purchase +250 If you need myopia -1.75 , please buy -175 Warm tips 1.Please correctly understand photochromic glasses, he color depth does not equal sunglasses 2.Test discoloration, it is recommended to test at noon, noon sun UV strong, discoloration can achieve the best results, more test several times, the effect is better. (customize order can make them two eyes different degree +0.5 to +6.0) What are photochromic lenses? Photochromic lenses are mainly used in open-air fields, snow fields and indoor light sources, so as to prevent sunlight and ultraviolet light from damaging the eyes. Photochromic lens optical glass containing silver halide microcrystals, phototropy reversible reaction according to the principle, in the sunlight and UV irradiation variable dark, completely absorb ultraviolet and visible light absorption of neutral; back to the dark, can restore the colorless transparent. Photochromic lenses are also referred to as light-sensitive lenses". Glass lenses are adding silver halide, but now is the mainstream of photochromic resin lenses, adding of spiro and other chemicals in the acrylic resin lens, so that the original colorless and transparent lenses, in bright light, will become colored lenses, to do the protection, so is suitable for indoor and outdoor use.
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