Tears NaturaleAll of their products are great. If you find yourself spending a lot of time in front of screens in dry air conditioned environments these eye drops are great.
If you know any old guys who have been into computers forever you'll find they get vision problems more than people who haven't spent their time staring at screens. One of the main causes for this is that we FORGET TO BLINK. Seriously.
EDIT: I buy either the plain Teats Naturale or the Tears Naturale II. They both work exactly the same for me but the II can be found in larger bottles.
If you find your eyes are feeling uncomfortable give this stuff a shot. It ranges in price from around 8 bucks to 14 bucks depending on the drops and the shop.