I recently purchased glasses online for the first time, from EyeBuyDirect. I got a pair specifically for computer use, with a weaker prescription, smaller pupil distance, and lower index of refraction to cut down on chromatic aberration. For $45 I'm fairly satisfied, even though I haven't quite got the frames adjusted for a perfect fit yet. The chromatic aberration is still noticeable when I look for it, but definitely smaller than my regular glasses, and I'm hoping that in the long run it will be less distracting with the new pair.