Refractive errors and astigmatism Archive

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What's the difference between bifocals, trifocals, and progressive lenses?

Bifocals have two vision zones: the top helps with distance and the bottom for close viewing. Trifocals add a third zone in the middle for middle-distance tasks, such as computer work. Progressive lenses cover all distances, but with no lines in the lenses.

Tips for adjusting to bifocals and other specialty lenses

Adjusting to bifocals, trifocals, or progressive lenses can be challenging. Unlike traditional glasses, these versions include two or more vision zones. Because people use different parts of the lens for different tasks, objects can seem slightly distorted when they move their eyes.

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