The direction of lines in striped glasses creates powerful optical illusions on facial geometry. Vertical and diagonal striping draws focus upward, effectively lengthening round face shapes and adding structural definition to softer features. Conversely, bold horizontal stripes add visual width across the browline, making them ideal for balancing narrow facial contours or high cheekbones. Checking total frame measurements against your cheekbone width before ordering helps ensure the pattern scales perfectly with your face.