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Sounds like a good, strong password for your email account — but these seemingly random letters and numbers are actual measurements that may appear on your eyeglass prescription. If you have trouble understanding your prescription and what it means for your vision, you’re not alone. “Most people don’t know what each part of the prescription means,” says optometrist Thomas Krainz, OD. “But those pieces add up and offer a good picture of your eye health. It’s always good to know how and when your prescription changes.” Many people, even those who don’t wear glasses, find that their vision changes as they age. Most adults experience vision changes after 40 and more than 92% of Medicare beneficiaries 65 and older report using glasses. “It’s a natural part of aging,” Dr. Krainz says. “Most people will get a prescription for eyeglasses at some point in their lives.” And non-prescription “cheaters” will only get you so far. Dr. Krainz demystifies eyewear prescriptions for us. How do I read my eye prescription? Eyeglass prescriptions generally follow the same format, with the information displayed in a table. Abbreviations and numbers provide information for each eye that helps determine details of your new eyeglass lenses, such as their: Shape. Strength. Type. “Each eyeglass lens is a tool that helps you focus and see clear images,” Dr. Krainz says. “When you look at your prescription, don’t think of it as an indication of eye weakness or strength. Each new prescription offers the best way to focus your eyes.” Each part of your eyeglass prescription has a different designation that pertains to a different part of your eyes or vision. Here’s what it all means.