You could also have allergies. This is the time of year when allergies start going wonko for some people. Tree pollens are starting to come out now, I've had to use Rx eye drops the past few weeks because of allergies.

You can ask your ophthalmologist if they can prescribe something for that.

I get really dry eyes in the spring. (like Death Valley dry!) My ophtho gave me a Rx for something called Pataday...ridiculously expensive, but gosh does it work great!