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It's not exactly what you describe, but could this Penny Arcade strip
be what you're thinking of? Gabe doesn't actually get the surgery but it does feature the joke about confusion between laser "eye-surgery" and "laser-eye" surgery.
cant find the exact comic, but im pretty sure League of Super Redundant Heroes made that joke at some point.

About what it sounds like. Remember a webcomic I enjoyed which had one strip I particularly remember in which someone supposedly got laser eye surgery, prompting questions of why they still wore glasses. It was clarified as "Laser-eye" surgery — surgery to enable them to shoot lasers from their eyes. (It has some similarities to The Infamous/REP!, but I'm fairly certain it was color.)