The short answer
Pick frames that contrast with your face: angular frames for a round face, round or oval frames for a square face, frames that are lighter at the top for a heart face. Make the frame about as wide as the widest part of your face, and let its top follow your eyebrows. Comfort and your own taste beat any rule.
Open the free toolHow to choose glasses for your face shape
To choose glasses for your face shape, look for a frame that contrasts with the outline of your face and is about as wide as its widest part. Opticians and style guides come back to the same few ideas, and you can try them in a few minutes in front of a mirror.
Find your face shape
Measure your face or use the Face Shape Detector for glasses. On that page the “Glasses” section opens first and compares the frame width with the width of your face. No photo? Type four measurements into the manual form.
Contrast the shape
Curves balance angles, and angles balance curves. A round face gets structure from straight lines; a square face looks softer behind round or oval lenses.
Match the width
The frame should be about as wide as the widest part of your face. Much narrower makes the face look wider; much wider and the frame takes over.
Follow the brow line
The top of the frame should sit near your eyebrows and roughly follow their line, so the frame draws the eye to your eyes.
Glasses for a round face: square and rectangular frames
Glasses for a round face balance it with straight lines: rectangular, square or geometric frames that are wider than they are deep. Their corners add structure to full cheeks and a rounded chin, and the horizontal line makes the face look a little longer.
Square glasses for a round face suit people who like a bolder look, especially with a thicker rim. Rectangular glasses for a round face are the quieter choice and fit almost any day. Browline frames and cat-eye frames with a straight top work too.
- Go easier on small round frames, which repeat the curve of the face.
- Frames narrower than your cheekbones make the face look wider.
- Very rounded cat-eye and teardrop shapes add curves where you wanted lines.
Glasses for an oval face: what to look for
Glasses for an oval face can be almost any shape, because the face is already balanced: a little longer than wide, with a soft chin. Size matters more than shape. Choose a frame at least as wide as the widest part of your face, or a touch wider, and not so deep that it sits on your cheekbones.
Geometric and rectangular frames add some structure, round and oval frames keep the look soft, and aviators and browline frames are classic choices. Very oversized frames can upset the natural balance, and very small ones can look lost. Strong colors and thick rims are easy to wear on this shape.
Glasses for a square face: round, oval and browline frames
Glasses for a square face soften the jaw and forehead with curves, so round, oval and browline frames are the usual picks. The curves contrast with the straight sides of the face, and a browline frame, heavier at the top, pulls the eye up toward the eyes and away from the jaw corners.
Choose a frame slightly wider than the jaw. Advice on the rim differs: thin rims keep the look gentle, while a bold round frame in black or tortoiseshell makes a strong, deliberate statement. Boxy frames with sharp corners repeat the angles of the face; if you like that look, wear it, but it emphasizes the angles instead of softening them.
Glasses for heart, diamond, long and triangle faces
For the other four shapes, the frame adds width where the face is narrow and stays light where it is wide.
| Face shape | Frames to try | Why they help | Go easier on |
|---|---|---|---|
| Heart | Bottom-heavy, oval, rimless, thin light metal, light aviators | A little weight low down, a quiet top next to the wide forehead | Heavy, dark top rims |
| Diamond | Oval, cat-eye, rimless, browline | A strong top line adds width at the narrow forehead and softens the cheekbones | Narrow frames that end inside the cheekbones |
| Long (oblong) | Deep frames, oversized frames, decorative or contrasting temples | Taller lenses shorten the face; detail at the sides adds width | Small, narrow frames |
| Triangle (pear) | Browline, cat-eye, top-heavy frames, color on the top rim | Width at the narrow forehead balances the wider jaw | Bottom-heavy frames |
Eyeglass frame styles explained, from rectangular to rimless
Frame names describe the outline of the lens and where the rim is heavy. Here is what each one means and which faces usually choose it:
- Rectangular: wider than deep, straight lines. Round, oval and heart faces.
- Square: about as deep as wide, with clear corners. Round and oval faces.
- Round: circular lenses. Square faces, and long faces when the frame is deep.
- Oval: a stretched circle. Square, diamond and heart faces.
- Cat-eye: the upper outer corners sweep up. Diamond and triangle faces, and round faces in straighter versions.
- Aviator: teardrop lenses, often with a double bridge. Oval, long and triangle faces, and heart faces in light metal.
- Browline: a heavy top rim with a thin or no lower rim. Square, diamond and triangle faces.
- Rimless: lenses held by small screws or a thin wire. Heart and diamond faces, and anyone who wants glasses to recede.
- Oversized: large lenses that cover more of the face. Long faces; on small or oval faces they can take over.
How glasses should fit: bridge, temples and frame size
A frame only suits your face shape if it fits. Check these points in the mirror:
- Eyes centered: your eyes sit near the middle of each lens, not close to the inner or outer edge.
- Bridge: the frame rests on your nose without pinching and does not slide down when you look at the floor. On metal frames the nose pads can be adjusted.
- Temples: the arms run back past your temples without pressing and rest over your ears.
- Width: the frame lines up with the sides of your face without squeezing.
Questions you might still have
What glasses look good on a round face?
Frames with straight lines: rectangular, square or geometric frames that are wider than they are deep. They add structure to soft curves. Small round frames repeat the shape of the face.
Square or rectangular glasses for a round face: which is better?
Both work. Square frames are bolder and work well with a thicker rim; rectangular frames are quieter and suit more occasions. Pick the pair you feel more like yourself in.
Should glasses be wider than your face?
About as wide as the widest part of your face, or a touch wider on an oval face. A frame much narrower makes the face look wider, and one much wider takes over.
Can I wear round glasses with a round face?
Yes, if you like them. The rule is about contrast, not permission. A thicker rim, a slightly wider frame or a straighter top line keeps round lenses from repeating the face shape.
What do the numbers on my glasses mean?
Lens width, bridge width and temple length in millimeters, in that order. 52-18-140 means 52 mm lenses, an 18 mm bridge and 140 mm arms.
Do the same rules work for sunglasses?
Mostly. Contrast and width work the same way. Sunglasses are often larger, so check that the frame does not rest on your cheeks.
Sources & useful details
- All About Vision: Glasses for your face shape and skin tone (frames per face shape; reviewed by an ABOC optician); checked 2026-10-27
- All About Vision: Glasses for round face shapes (angular frames, opposites attract, frames to avoid); checked 2026-10-27
- All About Vision: Glasses for oval faces (most shapes work; oversized frames can upset the balance); checked 2026-10-27
- All About Vision: Glasses for square faces (round, oval and browline frames; dark, bold styles); checked 2026-10-27
- All About Vision: Glasses for heart-shaped faces (oval, rimless and light, minimal frames); checked 2026-10-27
- All About Vision: Glasses for diamond faces (oval, cat-eye, rimless, browline rims); checked 2026-10-27
- All About Vision: Glasses for long faces (larger frames, eyes centered, avoid narrow shapes); checked 2026-10-27
- All About Vision: Glasses frame sizes explained (lens 40–60 mm, bridge 14–24 mm, temple 120–150 mm); checked 2026-10-27
- American Academy of Ophthalmology: Learn the nine essential parts of eyeglasses (bridge, nose pads, pad arms, temples); checked 2026-10-27
- American Academy of Ophthalmology: Tips for choosing the right reading glasses (frames should fit face, nasal bridge and ears comfortably); checked 2026-10-27
- Community Eye Health Journal (2024): Prescribing and fitting spectacles, pupillary distance and the optical centre; checked 2026-10-27
- LoschaZ Face Shape Detector for glasses: face shape and frame width in your browser
- LoschaZ guide: face shapes and how to measure yours
These guides are written from the current LoschaZ tools and the sources listed above. Examples are illustrations, not tests on every device or promises of an identical result.
