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: Look at the inside temple arm of your current, best-fitting glasses. You'll see three numbers (e.g., 52-18-140) representing lens width , bridge width , and temple length . Match these as closely as possible to new frames.

: Some reputable sites like Warby Parker will ship you several sample frames for free so you can test them in person before adding a prescription. 3. Spotting Authentic Designer Frames buy designer prescription glasses online

One of the biggest hurdles online is fit. Use these three tools to narrow your search: : Look at the inside temple arm of

The Modern Guide to Buying Designer Prescription Glasses Online 52-18-140) representing lens width

: Modern retailers use 3D virtual try-on tools that allow you to see how frames look on your face via your webcam.