Modified aviator shaped clip-on's come in sizes 48mm to 62mm wide with UV400 non polarized lenses.
If you need help measuring your prescription glasses to find the correct clip-on sunglasses, please visit this link help selecting clip-on sunglasses.
Sizes Available Modified Aviator Clip-on's
48mm Width x 35mm Height
50mm Width x 37mm Height
52mm Width x 39mm Height
54mm Width x 41mm Height
56mm Width x 43mm Height
58mm Width x 45mm Height
60mm Width x 47mm Height
62mm Width x 49mm 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.