Ophthalmic and Sun Photo chromatic Glasses

Abstract

The people of all age groups use sunglasses as an aid to protect eyes against glare or wind and also as a fashion wear. The present younger generations is using these glasses mainly as fashion in different colours and varieties. The sunglasses are mostly manufactured in plane without power in various sizes, colours and shades. Photochromatic glasses are the latest introduction in the range of sunglasses in the country. These are special variety of glasses with the characteristics that when the sun light strikes on them the invisible micro-crystals of silver halides inside the glass automatically get darker and imparts colour and shade to the glass and in normal indoor light, the glasses revert to its colourless clear transparency. These glasses also protect eyes from UV rays and are useful both as sunglasses and reading glasses.