Rectangle (Eyeglass Frames)

Width clearly exceeds height, and the corners stay close to square rather than rounding off. That wide, shallow proportion is what separates a rectangle from a true square shape, and it is common enough to read as the default option whenever someone pictures a pair of glasses with no particular style attached.

Both acetate and metal versions are common, and each behaves as it does everywhere else: acetate holds color and thickness, metal takes adjustable pads and runs lighter. What is specific to this shape is how forgiving the proportion is to manufacture, since a wide shallow rectangle tolerates small errors in curve or corner radius that would show immediately on a tighter, more angular shape.

Square frames keep height and width close to equal, reading more formal than the flatter rectangle. Cat-eye frames start from a similar rectangular block and then sweep the outer corner into a point rectangle never has. Round frames trade every straight line for one continuous curve. Rectangle is the shape with the least built-in character, which is exactly why it flatters round, square and heart shaped faces alike and why a poorly chosen one looks anonymous rather than deliberate. The fix is usually in the details: corner radius, rim thickness and color carry more personality here than the outline does.

Lens height is the real strength of the shape. A rectangle wide enough for full coverage still keeps roughly 32mm to 38mm of vertical depth in most sizes, comfortably past the 28mm to 30mm a lab wants to stack a progressive lens without crowding the reading zone. Round and soft faces gain real structure from the straight lines and level brow. Already angular, long faces get little benefit, since a wide flat shape adds width without the vertical interest a rounder or upswept frame would bring instead.

Frame size runs on the usual three numbers stamped inside the temple, something like 54-18-145 for lens width, bridge width and temple length, and because the shape is forgiving, that width can drift a few millimeters past your own face width without looking obviously wrong the way a tighter shape would. Ask to see the frame in a color or corner radius other than the flattest option in the case, since the generic version usually sits closest to the door. Wipe lenses only after rinsing, since flat corners along a shallow rim collect the same grit any other frame does.