Be careful with the eyedrops. I've used moisturizing drops when I really needed to, but if you find yourself using them more than once or twice in a single day you really need to just step away from the computer, close your eyes and rest for a while. Consider drinking some water too, because your eyes rarely get that dry if your whole body isn't at least a little dehydrated. The eyedrops are safe and they're not to something to be afraid of, but using them a lot indicates that you have other problems that you really need to address.
In the immortal words of Socrates, who said, "I drank what?"