Why Frame Size Matters
Buying glasses online is convenient and affordable, but getting the right fit can feel like a gamble. Ill-fitting glasses slide down your nose, pinch behind your ears, or simply look disproportionate. The solution? Understanding a few key measurements about your face and how to read frame sizes. This guide will help you order glasses online with confidence.
Understanding Frame Measurements
Look at the inside of any glasses arm — you'll typically see three numbers, like 52□18-140. Here's what they mean:
- 52 — Lens Width: The horizontal width of one lens in millimeters.
- 18 — Bridge Width: The distance between the two lenses across the nose bridge.
- 140 — Temple Length: The length of the arm from hinge to tip.
How to Measure Your Face at Home
What you'll need: A flexible measuring tape (or a piece of string and a ruler) and a mirror.
- Temple-to-temple width: Measure across your face from one temple to the other, just above your ears and across the bridge of your nose. This helps determine your total frame width.
- Nose bridge width: Measure the width of your nose where glasses would sit. If you have existing well-fitting glasses, measure the distance between the inner edges of the lenses.
- Ear-to-ear distance: Measure from the front of one ear, around the back of your head, to the front of the other ear for temple length reference.
Frame Size Categories
- Small/Narrow (Lens 44-48mm): Best for petite or narrow faces. Total frame width typically under 130mm.
- Medium (Lens 49-53mm): Fits most adult faces. Total frame width 130-140mm. This is the most common size.
- Large/Wide (Lens 54mm+): For broader faces or those who prefer an oversized look. Total frame width over 140mm.
Pro Tips for a Perfect Fit
- Check your current glasses: If you have a pair that fits well, the measurements are printed on the frame arm. Use these as your baseline.
- Eyebrow alignment: Your eyebrows should sit just above or in line with the top of the frame — never inside the lens area.
- Smile test: Glasses shouldn't ride up when you smile. If they do, the temple length may be too short.
- Width check: When looking straight ahead, your eyes should be centered in each lens. If your eyes are too close to the inner or outer edge, the frame width is wrong.
- Asian fit consideration: If you have a lower nose bridge, look for frames with adjustable nose pads or specifically designed for Asian facial features. Rongchy's TR90 frames are designed with universal-fit nose bridges.
Shop Rongchy with Confidence
Every Rongchy product listing includes detailed frame measurements. Our spring hinge designs provide flexible temple tension that adapts to your unique face shape. From compact cat eye sunglasses to oversized reading glasses, find a frame that feels like it was made for you.
Free worldwide shipping | 30-day easy returns | Detailed measurements on every product page