What Power Reading Glasses Do I Need?
A simple eye test chart has been developed by the reading glasses industry to show the differences in magnification between the various diopter strengths. This eye test chart is provided below to give the buyer of reading glasses a perspective on the effects of using various diopter strengths. To use this chart:1) Print this screen. Reason for printing: Every computer monitor has a different size and resolution. To be sure that the font size in the eye test chart is accurate, the chart should be viewed from a printed copy, not directly from the computer screen.
2) The eye test chart below should be exactly 5 inches wide. Please make sure it is 5 inches wide on your printed copy. If the printed eye test chart is larger or smaller, the chart should be viewed on a different computer monitor.
3) To find the diopter strength needed: Read the printed eye test chart from a distance of about 14 inches. Each line has a line of text with a corresponding lens strength reflected on the right. If an individual was using this eye test chart to determine their diopter strength requirement, the individual would determine which line has a text size that is difficult to read and note the diopter strength on the right.