Computer Glasses vs Reading Glasses — What's the Difference?
Many people assume reading glasses work for computer screens. They don't — or at least, they shouldn't. The distance matters, and using the wrong strength can actually cause more eye strain than wearing nothing at all.
The Distance Problem
Reading glasses are optimized for a focal distance of 14-16 inches (35-40 cm) — the typical distance for books and phones. Computer screens are usually 20-26 inches (50-65 cm) away. That's 1.5x the distance, which requires approximately 0.50 to 0.75 less magnification than your reading prescription.
How to Calculate Your Computer Glasses Strength
Take your reading glasses strength and subtract 0.50 to 0.75:
If your reading strength is +2.00, your computer strength is approximately +1.25 to +1.50.
If your reading strength is +1.50, try +0.75 or +1.00 for computer use.
What About Progressive Computer Glasses?
Progressive (no-line bifocal) computer glasses — sometimes called office lenses or near-variable focus — are designed specifically for intermediate distances. The top portion is set for screen distance (20-26 inches), the middle for mid-range (arm's length), and the bottom for reading (14-16 inches). They're more expensive ($150-300 online), but eliminate the need to swap glasses at your desk.
Our Recommendations
For most people, a dedicated pair of computer readers from Amazon is the most cost-effective option. Look for lenses labeled computer glasses or mid-range readers with blue light filtering (most screen-use glasses include it). Expect to pay $15-30 for a quality pair.