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This symbol indicates the different strengths of reading glasses and how they are measured. The lower the number, the weaker the strength of the glasses, while. A: Generally speaking, if the glasses are too weak or too strong AND if you're not holding the reading material in focus, you can experience eyestrain and. + reading glasses. A strong power for reading glasses meant to focus the eye when reading small print. Not sure which strength you need? Contact us about a.

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To find the right lens power for you, read the chart at the normal reading distance of 15 to 16 inches. The first line you have difficulty reading is the. strength reading glasses are perfect for those who do not have poor enough eyesight to require glasses, since no prescription is necessary. Corrects From.5 to Power; Lightweight Polycarbonate Frame; Available in Round or Square Styles; Durable, Made-to-Last Spring Hinges. Flex Focus Optics.

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Corrects From.5 to Power; Lightweight Polycarbonate Frame; Available in Round or Square Styles; Durable, Made-to-Last Spring Hinges. Flex Focus Optics. The important thing to remember when choosing reading glasses is, the higher the number, the greater the power or magnification of the lenses. So, glasses with. 25 diopters to differentiate stronger and weaker corrective powers. Someone who needs strong vision correction will likely need reading glasses with a strength.