Prescription sunglasses mathematical function the same way as regular sunglasses, the only difference of opinion is their lenses are customized specifically to correct the user’s vision trouble. They should have 100% ultraviolet radiation sickness protection, since regular exposure to the sun’s ultraviolet rays ,even on cloudy days can lead to even more eye problems. Some of the diseases that can resolution are photokeratitis, cataracts, and macular degeneration. Having minor vision problems like shortsightedness is bad enough; getting more serious diseases because of failing to wear proper corrective sunglasses surely would be a disaster .