Is it allergies or what?

For the past couple of days or so, I have been having such problems with my eyes. They have been burning and itching like crazy, which makes me want to rub them, which makes it all worse. I'm trying to figure out if it is environmental allergies or what. In the meantime, I finally tracked down some eye drops which help after a few minutes - so that makes me think it isn't allergies (they aren't allergy type of drops). Long I was 'diagnosed' with having not enough of one of the layer of protection on your eye - apparently, there are three layers of liquid protection on your eyeball - the outer one is the one that helps to keep other two from evaporating into the air, I think the middle one is the salty one and I can't remember what the other one does. In any case, I don't have very much of the outer layer, which means that my eyes dry out (evaporate) easily. Generally, this isn't really a big deal - it does mean that I won't ever be able to have contacts and since I only use my glasses when on the computer, that's not a problem. But it does mean that my eyes are easily irritated. Maybe that's just it - they are irritated.