I have diagnosed "dry eye syndrome"... which basically means midwestern, fair-skinned guy with blue eyes. My ophthalmologist (actual eye MD, not an optometrist) put me on preservative-free refresh optive and 3 grams of flax oil or fish oil per day. I chose flax, as it's easier on my stomach and doesn't give me fish burp. As a software developer who spends all day staring at a screen at work, this has changed my life... seriously.
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*The lemon-flavored tastes like lemon starbursts
Both of these items cost about 30 bucks a month, but I don't mess around with my eyes. If you don't want to spring for the fancy flax oil, you can get milled flax seed at most grocery stores and just mix it in with yogurt or a shake or something. That'll save you a lot of money.
If you're ok with fish oil, people swear by this supplement:
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