Previous to the last few years, the only materials available for use as lenses were glass and a hard resin called CR-39. But recently, high index lenses have become available. High index materials are named because they have a higher index of light refraction. Basically, they can do the same job that glass or CR-39 does, but high index lenses are much thinner and lighter. With high index lenses, you can avoid having “soda bottle” lenses.

When learning about high index lenses, you may hear many unfamiliar numbers and terms. Here are a few things to remember.

Polycarbonate

The first and still the most popular high index plastic is polycarbonate. Polycarbonate was originally developed for fighter jet cockpits. It is very strong, very light, and resistant to scratches and breaking. Most sports lenses are made of polycarbonate.

Mid-Index

Other high index materials are classified by numbers. The higher the number, the thinner and lighter the lens. The lower numbers are classified as mid-index lenses. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39.

High-Index

High index lense are much thinner than regular glass or plastic. Talk with your doctor to decide which high index lens is right for you.

Interactive Video Player Interactive Video Player Interactive Video Player Interactive Video Player
map

Find Us

CustomEyes Family Optometry
1611 Tiki Lane
Lancaster, OH 43130

Phone: (740) 687-1555
Fax: (740) 785-4013

Latest News

Are My Reading Glasses Making My Eye Worse?

by CustomEyes Family Optometry

Will reading glasses make your eyes worse? The short answer is "No."

Although we don’t know the exact mechanism by which humans have a decreased ability to focus up close as we age (a process called presbyopia), the fact remains that it will...

Video Education Library

bcm_videoplayer_banner

Watch Videos

woman rubbing her dry eye

Dry Eye Management

Visit our Dry Eye Management area

nearsighted woman reading a book

Myopia Management

Otherwise known as nearsightedness.

man shopping for glasses online

Order Products with our Online Store

It is quick and easy.