If you’re looking for over-the-counter reading glasses, the strongest lenses are +3.00 Though it does vary from country to country.What are the strengths of reading glasses?
Reading glass power is measured in units called diopters. The lowest strength is usually 1.00 diopters. Glasses go up in strength by factors of .25 (1.50, 1.75, 2.00). The strongest glasses are 4.00 diopters.How do you choose reading glasses?
How To Choose The Right Magnification Of Reading Glasses. Round that number up to the closest .25 increment. For example, a 57 year old person would subtract 35 and get 22. Place the decimal point to get 2.2 and then round up to 2.25. Step 2: Put on a pair of reading glasses with the magnification you calculated and hold some reading material at your normal reading distance, generally 12 to 17 inches.