I have symptoms of eye dryness.

Since when, I have been experiencing a gritty and stinging sensation in my eyes, as if sand grains have entered. I spend all day on the computer, and perhaps because of that, my vision has also deteriorated, and I hardly produce tears even when I yawn. Recently, the sensation of stinging and aching has become more severe than the gritty feeling, making it very uncomfortable to keep my eyes open. I keep using artificial tears and applying a lukewarm cloth for compresses, but it still feels uncomfortable. Should I take supplements? Should I visit an ophthalmologist now?