Chanel 9578B Oval Sunglasses

Our sizes read lens–bridge (e.g. 54-18mm). Frame width ≈ 2 lenses + bridge + ~10 mm of hinges, and it's what decides the fit (*lens widths assume an 18 mm bridge). Pick a frame about as wide as your face; ±2 mm on the lens feels the same.

Not sure of your shape? Tie your hair back, take a straight-on selfie and trace your outline.

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  Oval face

  Longer than wide, soft curves, forehead a touch wider than the chin.

  Balanced proportions suit almost every shape. Just match the frame to your face width.

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  Shop frames for oval faces →
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  Round face

  Length and width about equal, full cheeks, soft jaw without sharp angles.

  Angular frames add structure and make the face look longer. Skip small round frames.

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  Shop frames for round faces →
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  Square face

  Forehead, cheekbones and jaw roughly the same width, strong defined jaw.

  Curved frames soften strong lines. Skip narrow, boxy frames.

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  Heart face

  Wide forehead and cheekbones narrowing to a slim or pointed chin.

  Light rims and frames wider at the bottom balance the forehead. Skip heavy top bars.

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  Shop frames for heart faces →
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  Oblong face

  Clearly longer than wide, straight cheek line, often a tall forehead.

  Tall, wide frames break up length. Skip small, narrow frames.

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  Shop frames for oblong faces →

1. WidthNo gap at your temples and no pinching. The frame ends right where your face ends.
2. BrowsThe top of the frame follows your brow line, brows just visible above it.
3. EyesYour eyes sit near the middle of each lens, not at the inner edges.
4. NoseThe bridge rests without sliding when you look down or leaving red marks.
5. CheeksThe frame doesn't touch your cheeks when you smile.

Arms a little loose or tight? An optician can adjust most acetate and metal frames in minutes.