Round, Oval, and Square, Choosing Glasses for Three Basic Face Shapes
According to All About Vision and the American Optometric Association (Optometrists.org), the core principle of frame selection is 'contrast.' Choosing frames that oppose your face's natural lines creates a balanced impression.
For round faces (similar width and length with soft curves), angular frames are ideal. Rectangular, square, and geometric frames add structure to soft features. Cat-eye frames also work well by drawing the eye upward. Round frames should be avoided as they emphasise the face's roundness (Heartland Optical).
Oval faces have the most balanced proportions, and most frame styles suit them well. Warby Parker recommends square, rectangular, or geometric frames to add structure atop natural balance. The key is selecting frames that are as wide as or slightly wider than the face's broadest part.
Square faces feature a strong jawline and broad forehead. Round or oval frames effectively soften angular features. Thin frames slightly wider than the cheekbones provide a natural counterbalance. Aviator frames are also a great choice for softening angular impressions (LensDirect, Optica Optometry).
Heart, Diamond, and Oblong, Frame Selection for Special Face Shapes
Heart-shaped faces are widest at the forehead and taper to a narrow chin. All About Vision recommends frames with wider bottoms or light-coloured rims, semi-rimless, or rimless glasses. These disperse attention from a broad forehead and add visual weight near the narrow chin. Cat-eye frames also highlight cheekbones and lift the face. However, excessively thick upper frames may make the forehead appear wider (Warby Parker).
Diamond-shaped faces are among the rarest, with narrow foreheads and chins and broad, prominent cheekbones. Cat-eye or oval frames highlight cheekbones while harmonising with the narrow forehead and chin. Rimless glasses give a clean look without overpowering delicate features (Zenni Optical, EyeBuyDirect).
Oblong (rectangular) faces are longer than they are wide. Oversized frames add visual width, and round or square lenses balance facial proportions. Deep frames with tall lenses are key. Narrow or short rectangular frames should be avoided as they can make the face appear even longer (Visionworks, All About Vision).