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Lens Materials.

Glass Lenses

Polycarbonate

Polycarbonate lenses are up to 10 times more impact-resistant than plastic or glass lenses.  They are lightweight and provide 100% protection from the sun's UV rays.  Polycarbonate lenses are a good choice for comfort, durability, and outdoor applications. This is by far the most commonly used lens material for prescription eyewear today.

Plastic Lenses

Plastic

Plastic lenses are half the weight of glass lenses and have good optical quality.  The CR-39 plastic is not as durable as polycarbonate but in some cases can be substitued for polycarbonae as a low-cost lens for daily use. However, it can be quite heavy in higher power prescriptions.

Polycarbonate Lenses

Trivex

Trivex is a newer lens material developed in 2001. Like polycarbonate, Trivex is thin, lightweight, and more impact-resistant than CR-39 plastic or glass lenses.  Trivex, however, has less chromatic aberration than polycarbonate lenses producing crisper optics.


 

Trivex Lenses

Hi-Index
 

Hi-Index lenses are thinner than polycarbonate and Trivex lenses, although not as durable.  This material is recommended for those who require a strong eyeglass prescription to correct nearsightedness, farsightedness and/or astigmatism. Hi-Index lenses are the most aesthetically pleasing lenses, especially in thin frames. 



 

Hi-Index Lenses

Glass

Glass is used in some harsh environments when other lens materials cannot standup to the conditions.  Glass is much heavier than any of the other materials and should only be used when other materials can’t withstand the harsh environment, they are used in.