yes, you are right in that plastic is more prone to scratches, but the crux of the problem is how careful you handle your specs. If anyhow place or throw your glasses around or put inside your pocket etc, even glass lenses will get scratches. I ever bought new glass lenses that are already with scratches when presented to me by the salesgal. She kept looking at the glass lenses & keep wiping with cloth, presumably thinking that those can be removed. When i got home & i only realised that they are scratched, it dawn on me that even glass can be scratched if you not careful.
But frankly speaking, plastic lenses also have anti-scatch coatings so actually they are still a better option, considering the comfort factor. If you wear specs all the time, you would want the weight of your specs to be minimised as much as possible, so everything counts, even the lenses add weight on your nose although some opticians tell you that plastic lenses dont count for alot of weight but they still do affect how comfy you feel throughout the day.
Even with plastic lenses, i can feel the difference in weight when im wearing a frame with smaller lens size compared to a frame with bigger lens size. I conclude that size of lenses play a part in the weight as well, and not just the lens material or frame itself. If you really like glass lenses, i recommend getting a very small frame with corresponding small lens size so that you dont feel it heavy. BUT you got to have a frame that is curved enough at the temples to fit the width of your head else the frame will keep digging into the sides. If you have a small head then no prob.
