Frame Size Explainer

Eyeglass frames are often marked with three numbers: lens/eye width, bridge width, and temple length (for example, 52□18 140), in millimeters. Fit also depends on face width, pantoscopic tilt, wrap, and how the frame sits on the ears and nose.

This tool explains those numbers and typical ranges. Comfort and optical alignment still require real-world fitting, especially for progressives.

Follow these educational steps:

1. Find the size stamp on your current frames (inside temple or bridge area).
2. Enter lens width, bridge, and temple values into the tool.
3. Read the plain-English interpretation and fit considerations.
4. Compare with a new frame’s markings rather than assuming one size fits all faces.

Larger eye sizes create wider lenses; bridge width affects nasal fit; temple length affects ear hook position. Aesthetically similar frames can fit very differently.

Optical labs also care about frame dimensions because lens thickness and edge aesthetics depend on frame opening and decentration.

The tool cannot guarantee online frames will fit your face or that PD will match a chosen frame.

It is not a substitute for an optician adjusting nose pads, temples, and vertex distance.

Important limitations:

• 3D face shape, cheekbone height, and hair/ear anatomy are not captured by three numbers.
• Sport wraps and safety frames follow different standards.

Visit an optical professional if frames slip, pinch, cause sore ears, or misalign progressive corridors. Children need careful sizing as they grow.