Eyewear & Sunglasses Size Guide

Understanding Eyewear Frame Sizing

Eyewear sizing is more precise than most clothing measurements because frames must fit your face correctly for both comfort and optical performance. The three key measurements—lens width, bridge width, and temple length—are usually printed on the inside of your current frames (e.g., 52-18-140). These numbers, measured in millimeters, determine how the frames will sit on your face, whether they'll pinch your nose, and if the temples will reach comfortably behind your ears. Our eyewear size guide helps you decode these measurements and find frames that fit perfectly, whether you're shopping online or in-store.

Key Tips for Eyewear Sizing

• Find Your Current Frame Size: The easiest way to find your size is to check your current glasses. Look on the inside of the temple arm for three numbers (e.g., 52-18-140). These represent lens width, bridge width, and temple length in millimeters.
• Lens Width Affects Face Coverage: Lens width (typically 40-62mm) determines how much of your face the frames cover. Smaller faces (women, teens) usually need 48-54mm, while larger faces (most men) need 54-58mm or larger. The lenses should align with your temples.
• Bridge Width is Critical for Comfort: The bridge (typically 14-24mm) must fit your nose properly. Too narrow and the frames will pinch; too wide and they'll slide down. Asian fit frames have wider, lower bridges for flatter nose bridges.
• Temple Length Ensures Stability: Temple length (typically 135-150mm) should allow the arms to rest comfortably behind your ears without pinching. If temples are too short, the frames will feel tight; too long and they'll slide forward.
• Consider Face Shape: Round faces look better in angular frames, square faces in round frames, oval faces can wear most styles, and heart-shaped faces suit bottom-heavy frames. This is about aesthetics, not fit, but it matters for overall appearance.

Common Eyewear Sizing Mistakes

The most common mistake is buying frames based solely on style without checking measurements. A trendy frame that's the wrong size will be uncomfortable and may cause headaches. Another error is not accounting for prescription lens thickness—high prescriptions make lenses thicker, so smaller frames are often better to minimize lens thickness and weight. Additionally, many people don't realize that sunglasses and optical frames may fit differently even with the same measurements because sunglasses often have larger lenses and different weight distribution. Finally, don't forget about adjustability—metal frames can be adjusted by an optician, but plastic frames have limited adjustability, so getting the right size initially is more critical.