If you’re buying readers specifically for computer use, you might need a than what you use for printed books. Because monitors are usually further away (20+ inches) than a book (14 inches), a +1.25 might be better for the office even if you use a +1.75 for novels. Look for "Blue Light Blocking" coatings if you spend hours staring at a screen. 4. Check the Fit and Style
If you can’t find a chart, strengths usually correlate with age: Age 40–45: +0.75 to +1.00 Age 45–50: +1.00 to +1.50 Age 50–55: +1.50 to +2.00 Age 60+: +2.50 and up 2. Choose Your Lens Type how to buy readers
Most retailers provide a printable diopter chart. Hold it about 14 inches away and see which line of text is the smallest you can read clearly. If you’re buying readers specifically for computer use,
The entire lens has magnification. Best for long sessions of reading a book or tablet. Hold it about 14 inches away and see