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A: Many people who reach the age where they require bifocals or reading glasses find their regular glasses don’t work well when they’re at their computers. The explanation is simple.

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Most eyeglasses are designed to optimize distance vision — usually defined as 20 feet away and beyond. Most bifocals and reading glasses are designed to give focused vision — about 14 inches from the eye. A computer monitor sits farther away than where your bifocal can focus but is too close for distance correction.

If you use a computer for long periods of time, you could consider “computer glasses.” These focus at the specific distance at which your computer monitor sits.

Alternatively, you could consider progressive bifocals. These glasses focus at multiple distances. With a slight change in head position, you can often find the spot in your glasses where you can clearly see the computer.

— Ophthalmologist Richard E. Gans, MD

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

If your regular glasses don’t work well when you’re at your computer, here’s why and what you can do about it.