Several compliance issues could come up with the use of intraocular lenses (IOL) used in cataract cases performed on Medicare patients in ASCs. These compliance issues involve the use of premium lenses. When a Medicare patient has a presbyopia-correcting (PC) IOL or an astigmatism correcting (AC) IOL inserted instead of a regular IOL, there are special guidelines which must be followed by ASCs and ophthalmology practices to stay in compliance with Medicare guidelines.