It depends on your specific eye condition. There are two main types of eyeglasses that are made by glass or plastic. Basically, you would have stronger prescription if you are deeper nearsighted or farsighted, thus your lenses are heavier. Glass lenses weigh about twice as much as plastic lenses. Although plastic lenses would be thicker than glass lenses, they are much more durable than glass lenses. Because glass is the material that easy to be broken, plastic is more shatter-resistant than glass lenses. However, glass is more scratch-resistant based on this material is much harder. Additionally, plastic lenses are more cost effective than glass lenses. And plastic lenses can have color added to them or taken out. But color in glass lenses is permanent.
