Reading Glasses Guide to Strength and Fit

If you are having trouble focusing on reading material or other objects 12 to 14 inches away, non-prescription reading glasses may be the solution. They are manufactured in an unending variety of shapes, colors, styles, fabrications, and prices. You can even find non-prescription UV-protected bifocal sunglasses for reading in the sun. Bifocal Sunglasses
CAUTION. If you've never worn over-the-counter readers, I strongly regemend that you talk to an optician or ophthalmologist before you buy your first pair. Although millions of people wear them successfully, readers arent for everyone. For example, if you have astigmatism or uneven eyes (different vision in each eye), non-prescription reading glasses may cause a headache or dizziness when used for any length of time.
LENS STRENGTH

The strength of over-the-counter reading glasses is measured in diopters, also referred to as powers or strengths.
Non-prescription readers are generally available in the 1.00 to 3.00 range in 1/4 increments. Higher strengths are available on a more limited basis.
Make sure you buy aspheric lenses; Otherwise you may experience dizziness or headaches. Aspheric lenses are ground so that there is no distortion or wavy vision.
FRAME FIT

Although most users know the strength they need, very few people know the measurements of their frames and rely instead on how they look and feel.The width of the frame across the front from temple to temple is probably the main consideration.
Youll find that the majority of reading glasses on okay measure between 5-1/2 and 4-3/4 inches wide.
If you dont know what width you want and dont have an existing pair to measure, heres a little guidance. If, for example, you have a larger head and prefer a wide frame, look for frames that measure at least 5-1/4 inches Don't worry about identifying an exact width you can wear. Spring hinges provide flexibility and gefort so you can wear a variety of frame widths. Just be sure that the frame you choose has spring hinges.