What is a lens index?

Lens index is a measurement on the lens thickness chart that dictates the thickness of your lenses. Made from higher-quality material, a high index lens will be able to deliver more powerful correction without the need for thicker lenses.

What is the difference between low index and high index glasses?

Low lens index glasses will be thicker but more affordable and only offer a low vision correction level. High index lenses have less material, making them thinner, lighter, and customized to address a wide range of vision correction. A 1.5 standard index lens is suitable for people with a weak prescription looking for an affordable option.

What is the difference between 1 57 and 1 61 lenses?

Prices begin at $0. What are the Differences Between 1.57 and 1.61 Lenses? The main difference between 1.57 lenses and 1.61 lenses are the thickness of the lenses at the edges: With 1.61 index lenses, your glasses will be ultra-thin at the edges, giving them a stylish look than with 1.57 index lenses which are thin.

What is refractive index?

In other words, the refractive index is the ratio of the speed of light in a vacuum divided by the speed of light in the lens material. A higher index means that light travels more slowly through the lens material and more bending of light rays occurs.