Before you start browsing, you must have two critical pieces of information ready. Note that eye prescriptions typically expire every one to two years:
: The length of the arms that go over your ears. buy glasses and lenses online
Based on testing and user satisfaction, several retailers stand out for specific needs: Before you start browsing, you must have two
: This is the distance between your pupils in millimeters. It is vital for aligning the optical center of the lenses with your eyes. While some doctors include this, others may not; if missing, many retailers provide downloadable tools or apps to help you measure it yourself. 2. Finding the Right Frame Fit It is vital for aligning the optical center
: A higher index (e.g., 1.61 or 1.67) results in thinner, lighter lenses, which is recommended for stronger prescriptions to reduce distortion.
: You need a recent prescription from an eye doctor. Be extremely careful when inputting the Sphere (SPH) , Cylinder (CYL) , and Axis values, paying close attention to plus (+) and minus (-) signs.
Online shopping removes the ability to physically try on frames, but you can minimize risk by checking measurements on a well-fitting pair you already own. Look for three numbers (e.g., 52-18-140) printed on the inside of the temple arm: : The horizontal width of one lens. Bridge Width : The distance between the two lenses.