How to measure your prescription frames for LensCover sunglasses:
1- Measure the widest part of your prescription frames left to right, this is the "width". Next measure the height of the lens with frame included.
2- Choose the LensCover frame that is slightly larger in width and height than your frame measurements. Extra Small is 4-15/16 inches x 1-1/2 inches high Small is 5-5/16 inches wide x 1-5/8 inches high Medium is 5-1/2 inches wide x 1-3/4 inches high Large Slim is 5-11/16 inches wide x 1-7/8 inches high Large is 5-3/4 inches wide x 2-1/8 inches high For example, if your prescription frames measure 5-1/4 inches x 1-1/4 inches , the correct Frame would be size Small. Hard Case for are available under a separate listing