Large Size Sunglasses That Fit Over Your Glasses
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  Fit Over Sunglasses Fitting 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 F43: 5 7/8" Wide x 1 7/8" Height
Style F15
:
 5 5/8" Wide x 2" Height
Style F18: 5 7/8" Wide x 2" Height
Style F22: 5 7/8" Wide x 2" Height
Style F29: 5 7/8" Wide x 2" Height

The above mentioned styles are pictures below.