Small Size Sunglasses That Fit Over Prescription Glasses
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  Fit Over Sunglass Sizing Chart

Step 1.  Measure your prescription glasses from the outside left to the outside right temple. 
Step 2.  
Measure the highest point of your glass lenses, it usually the middle of your lenses.
Step 3.  Use your measurement results to determine which style below will fit over your glasses. Your glasses must measure smaller than the measurements for each style below.

Style F13: 5 3/8" Wide x 1 1/4" Height
Style F12: 5 3/8" Wide x 1 3/8" Height
Style F25: 5 3/8" Wide x 1 1/2" Height
Style F3:   5 3/8" Wide x 1 3/4" Height
Style F21: 5 1/2" Wide x 1 5/8" Height

The above mentioned styles are pictured below.