Lens Material
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Glass - The first lens material used for eyewear has some of the purest optics of all materials and has a high degree of scratch resistance. However, glass is the easiest to chip, crack or shatter and is the heaviest of all materials. Many of today’s modern frames are not compatible with glass, but in some cases we can still process and dispense this material.
Conventional Plastic (CR-39) - This lens is lighter weight and more impact resistant than glass lenses. However, it is much thicker than any other material used to make lenses, so it is sometimes less desirable for prescriptions.
High-Index – This material is lighter weight and makes stronger corrections more attractive and comfortable. It is also great to use with drill-mount rimless lenses because it is durable and resistant to solvents. High-Index also has the ability to absorb harmful UV light.
Polycarbonate – This is lighter and thinner than glass or CR-39 and is nearly unbreakable. It is the material of choice for children and sports.
Trivex - This is the newest lens material available. It includes the clarity of the CR-39, the strength of polycarbonate and great light transmission for low light conditions. It works well for everyone, but is especially recommended for rimless and children’s eyewear.
Conventional Bifocals/Trifocals – Bifocals are segmented (lined) lenses used to correct both distance and near vision. Trifocals are lenses that help correct distance, near and intermediate vision.
Progressive – Non-segmented (no line) lenses that correct distance, intermediate and near vision, giving a smoother transition between near and far.
Computer Lens – This lens was designed with particular focal lengths for computer use.
