Lens Index & Material Guide

Illustration of glasses with lenses protruding from frame to show thickness.

Basic Lenses

Our basic plastic lenses are available in two indexes.

1.50 Standard Index (CR-39)

Suitable for full-rim plastic/acetate frames or full-rim metal frames
BEST FOR RX RANGE +1.00/-2.75 OR BELOW

Infographic for 1.50 standard index lens with five-point scale (least to highest): 1 for thinness, 3 for UV protection, 5 for clarity, and price is free.

1.57 Mid Index

Up to 15% thinner than 1.50 lens
Suitable for full-rim plastic/acetate or full-rim metal frames
BEST FOR RX RANGE +2.00/-3.75 OR BELOW

High-Index Lenses

Thinner and lighter than our basic lenses, high-index lenses are recommended for those with combined Rx powers over -3.00/+2.00. High-index lenses have reduced edge thickness for nearsightedness and reduced center thickness for farsightedness. Choose from 1.61, 1.67 or 1.74 high index lenses.
All Zenni high-index lenses are made with MR™, a premium lens material. MR™ is a trademark of Mitsui Chemicals in Japan, a global leading provider of ophthalmic lens materials and technologies.
$MR™ by Mitsui Chemicals, High Refractive Index Lens Material.$

1.61 High Index

Up to 20% thinner than 1.50 lens
Pricing starts at $20.95
Suitable for full-rim plastic/acetate, full-rim metal, half-rim, and rimless frames
BEST FOR RX RANGE +3.00/-5.75 OR BELOW

1.67 High Index

Up to 30% thinner than 1.50 lens
Pricing starts at $34.95
Suitable for full-rim plastic/acetate, full-rim metal, half-rim, and rimless frames
BEST FOR RX RANGE +4.75/-6.75 OR BELOW

1.74 High Index

Up to 40% thinner than 1.50 lens
Pricing starts at $75.95
Suitable for full-rim plastic/acetate or full-rim metal frames
BEST FOR RX RANGE +5.00/-7.00 OR ABOVE

Impact-Resistant Lenses

Impact-resistant lenses are a good choice for everyone, but especially great for kids and those who do sports. These lenses work well with all frame types.