High Index

High Index Lenses are Thinner and Lighter

Thinner and lighter high-index lens materials have made the world of eyeglasses much different.  Thin eyeglasses are attractive; thick ones aren't.  Light eyeglasses are comfortable; heavy ones aren't.  This impact resistant design has become a popular choice of patients who want the lightest, thinnest UV protected lenses possible.
Eyeglass lenses are able to correct vision because they bend light as it passes through the lens. The amount of light-bending (or refraction) that's needed to provide good vision is determined by the eyeglass prescription, which is provided by your Crown Vision Center Eye Doctor.

For weaker eyes, the number in the prescription is higher, and the lenses must bend the light more to provide clear vision. Prescriptions for nearsighted people begin with a minus symbol (-). If your prescription is -5.00, for example, you are very nearsighted and need a stronger lens than someone with a -2.00 prescription.

To bend light more, stronger minus lenses require thicker edges.  It's not unusual for a nearsighted prescription to worsen over time, which means the edges of your lenses will grow increasingly thicker with each prescription increases.

Fortunately, the eyecare industry is always researching and making advancements in eyeglass lens technology.    There are now a variety of new plastic lens materials that bend light more efficiently than the conventional plastic lenses used for eyeglasses.  So now your same nearsighted prescription can be corrected with less material to correct the same amount of nearsightedness.

Advantages

• Thin and lightweight appearance an excellent choice with many frame designs
• Absorbs 100% UVA/UVB
• 1.60 lenses are excellent for drilled rimless frames
• Plus lenses are flatter to reduce the “bug eye” effect
• Many high index lenses come systematic with a superior scratch resistant AR coating