Spectacles..

that is very nice that you can wear them that long. yes you should get scratch proof and sun proof ones next. dont get them at a place like walmart. i got mine there and have never been able to wear them. little did i know they only have 30 days to return!

There are dozens of different lenses you could have. They will all scratch. However, most now come with scratch-resistant coating on them, and (as has already been said) glass is more resistant than plastic. I can't use glass unless it's double-ground, as my specs are like milk-bottle-bottoms. Very thick. As for the best type, I remember the last time I changed mine Kodak were doing some rather lovely work. Scratchproof, anti-glare, heat and moisture resistant, non-misting and all those fancy things. Only £1,000 per lens. D'oh! Never heard of photoglass. I assume it's either sunglasses style or the old 'Reactolite' thing where they darken as things get brighter. No idea really, though.

I have been wearing spectacles for over 40 years. I have found that those made with plastic lens do scratch and bruise more than those made with glass. Those made with glass are more expensive. And unless they need to be changed often, like every two years, in my book they are the best bet. Photoglass lenses is like having your sunglasses put on automatically when you go out in the bright sun light. Some will get darker and darker as time goes by. Since you are in India I can't help much as to which is the best. No body said life would be easy. They just promised it would be worth it.