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: This is the horizontal distance between your pupils in millimeters. It ensures the "optical center" of the lens aligns with your eyes.

: Ensure your exam was within the last year. Pay close attention to plus (+) and minus (-) signs, as these indicate farsightedness and nearsightedness, respectively. buying glasses on the internet

: Many eye doctors omit this from your printed script to discourage online shopping. You can measure it yourself using a ruler and mirror or apps from sites like GlassesUSA . : This is the horizontal distance between your

: Look at the inside arm of your current, well-fitting glasses. You’ll see three numbers (e.g., 52-18-140) representing lens width , bridge width , and temple length . Matching these ensures the frames won't pinch your nose or slide down your face. Top-Rated Online Retailers Pay close attention to plus (+) and minus