Q:

What is a toric lens?

A:

Quick Answer

While a regular lens is shaped like a slice from a ball, a toric lens is shaped like a slice from the side of a donut, with a hole or depression in the middle area. Toric lenses are used in contacts and glasses to correct astigmatism.

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Full Answer

For corneal astigmatism, the way light is refracted within the eye differs between the horizontal and the vertical planes, creating a difficulty in seeing fine details or causing vertical lines to appear tilted. By using a toric lens, doctors can change the way light is bent at each point of the lens, matching the astigmatism perfectly.

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