Lighting glasses is a real trick; some glasses are more difficult than others but here are some ideas:
Set the Key light high and close, or around to the side, and fill with a bounce off the ceiling or someother place that does not find itself in the lenses.
Light from the off camera side; this way the reflection is rarely seen because of the anle of the bounce.
Use special non-glare glasses (talent that appears on TV often usually invest in these), sometimes you’ll still see the reflections.
Construct the key light to look like a real light source, so the reflection in the lens is believable.
Sometimes raising the camera fixes the problem, but be careful not to go too high and make a funny looking shot. Less a problem with women than men. In the same way you can sometimes just tilt the glasses slightly to minimize or eliminate the telltail reflection.
Tell us if you come up with some other solutions!
JS