Medicare covers one complete pair of glasses, after the last cataract surgery with intra-ocular lens replacement. The Medicare benefit includes a frame and two lenses.  As an alternative a pair of contact lenses can be covered in lieu of glasses.  

Medicare beneficiaries that have a condition called aphakia (patients who born without an intra-ocular lens, or who have had the lens removed and not replaced), Medicare will cover glasses, and/or contacts as often as is medically necessary.

When specifically prescribed for a medical condition documented in your medical chart, Medicare may also cover tint, anti-reflective coating, and/or UV.