How to Choose the Strength of Reading Glasses

With age, eyes lose their muscle elasticity, causing difficulty focusing. Individuals may find themselves moving books or computer screens closer or farther away; this is a sign that reading glasses are required. To use reading glasses properly, one must first determine the strength glasses should be in order to allow the wearer to read comfortably and without straining. Those who know how to determine the required strength of reading glasses can avoid headaches and improve their vision.

Instructions

• 1

  Test yourself with an eye chart. Eye charts can be found in drugstores or anywhere pre-made reading glasses are sold. Eye charts can also be found online. Typically, eye charts present a series of letters or a sentence in varying sizes next to a number representing a prescription strength. Whichever line is most easily read will determine the required strength of reading glasses.

• 2

  Determine the strength of the glasses based on age. Individuals in their early 40s typically require reading glasses with a strength of +1.25, while individuals in their late 40's need a strength of +1.75. For individuals in their 50s and older, typically glasses strength should be +2.25 or higher.

• 3

  Consult a pharmacist. Many drugstores have pre-made reading glasses in a variety of strengths, and pharmacists can assist in picking out the correct strength. Pre-made glasses are cheaper than prescription glasses, and pharmacists' help is free. Pre-made reading glasses can also often be purchased in bookstores or grocery stores.

• 4

  Visit an optometrist. The most accurate prescription comes from a doctor. Optometrists have tests to determine the required strength of reading glasses, and prescribe glasses. This is especially important, according to optometrists, if different strengths are needed for each eye.