I came across a great blog that explains how to get rid of reflection’s in a subject’s glasses that your trying to photograph. Often at times when this happens it can be rather frustrating to try and fix this issue so I found a few quick tips that should help in getting you out of this jam.
“Think of the light hitting the glasses as a pool ball. It’s going to reflect off of the glasses, no matter what. The thing is to position the glasses so that the angle is such that the light reflects harmlessly off into space. Doesn’t really matter where. Just not towards your camera.” – Strobist: Lighting 101 http://strobist.blogspot.com/2006/04/lighting-101-lighting-for-glasses.htm
Check out the comments section of this blog as well. There have been a lot of postings from various readers on other techniques that can be used.