Square shape clip-on sunglasses range in size from 52mm to 62mm.
If you need help selecting the correct clip-on sunglasses, please visit this link help selecting a clip-on sunglasses.
Sizes Available For Square Clip-on Sunglasses
52mm Width x 46mm Height
54mm Width x 48mm Height
56mm Width x 50mm Height
58mm Width x 51mm Height
60mm Width x 53mm Height
61mm Width x 53mm Height
62mm Width x 53mm Height
Measure the width and height of your prescription eyeglass frames, just one lens only. You want to measure from the outside rim left to right and then the top outside rim to bottom outside rim.