Discuss Natasha S's answer to: How can I protect my eyes and perhaps brain from rapidly reflecting light eminating from a touch tone computer screen cash register at work?

Have you ever heard of Computer Vision Syndrome?  It's basically when staring at a computer for prolonged periods of time causes eye strain, among other things.  At least you're not working in an office, where all you do is stare at a computer!

Here are some tips that can help minimize strain: http://www.allaboutvision.com/cvs/irritated.htm. 

If it really bothers you, there's always computer eyeglasses.  I'm sure you won't need those, though, since you're not always looking at the cash register.