Lens Materials

High Index Lenses

High index lens diagram | Coffman Vision Clinic in Bend OR

What are High Index Lenses?

High index lenses are thinner, lighter, and more visually appealing. High index lenses are made to be thinner at the edges of the lens and lighter in weight overall.

High index lenses are a good option for people who have strong prescriptions which creates more thickness in the lenses either on the edges or in the center of the lens depending on the prescription.

Light and thin options 1.67 / 1.74: Lenses that are 50% thinner than regular plastic lenses. This creates the lens to be thinner, but also keeps the look of you eye closer to how your eyes would look without glasses. In plastic lenses with high prescriptions you eyes can appear smaller or bigger with glasses depending on your prescription.

For your best comfort, better vision and improved cosmetic appeal, people with strong prescriptions really benefit from high-index lenses.

Polycarbonate Lenses

Polycarbonate lenses are 12 times stronger than regular plastic lenses, making them an ideal choice for children’s eyewear, safety glasses, and for anyone with an active lifestyle who wants a thinner, lighter, safer lens.Compared to plastic lenses, polycarbonate lenses are also 30% lighter and 25% thinner.

Plastic (CR-39) Lenses

For low prescriptions, regular plastic lenses are usually the best choice for prescription lens material.Sometimes you aren’t able to do plastic lenses because of the type of frame you choose.For example, if you have a three piece rimless eyeglass frame, or a half rim frame you should not use a regular plastic lens because it is likely to crack or chip under the strain.

Glass Lenses

Glass prescription lenses offer the best visual acuity of any eyeglass lens. However, over 95% of prescription lenses nowadays are made from some kind of plastic because using glass lenses has some restrictions and drawbacks. Glass lenses are almost twice as heavy as plastic lenses and not as safe as plastic lenses. Glass lenses cannot be used in rimless or semi rimless frames. Glass lenses take much longer than plastic lenses. You should allow two to three weeks for processing an order with glass lenses.