Lens Materials
The lenses in your eyeglasses can be made from different materials. Your optometrist will help you decide which is right for your special needs.
Plastic (Resin)
It is the most common choice for lenses typically because it is half the weight of glass. It can be tinted to almost any color and density, and is seven times more impact resistant than glass. Plastic lenses are more easily scratched than glass lenses.
Glass
This was the only lens material available up to the year 1943. It's the most scratch-resistant material, but twice the weight of plastic.
Polycarbonate
This is the most impact-resistant material available and is the lens of choice for young people and those with an active lifestyle. Polycarbonate lenses are inherently thinner than a standard lens and block all harmful ultraviolet light. This material is difficult to tint.
Photochromic - Lenses That Darken In The Sun
Available in both plastic and glass, this lens darkens when going from indoors to outdoors. These lenses perform well for about three years, then begin to lose their ability to lighten up.
High-Index - Lighter, Thinner Lenses
This lens is available in both plastic and glass. It has the quality of bending light faster. This allows for a thinner design. This is recommended for a person with a strong prescription. Thinner, lighter lenses are more comfortable and look better.
