Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great product for dry eyes

I use Hypotears to counteract dry eyes on airplane flights, during the winter, when I am tired, or at bedtime. These are not for redness - those types of drops have some chemicals I'd rather not put into my eyes. These are simply saline drops, with a preservative.I have used some other brands of saline drops, but they made my eyes itch. Apparently I was allergic to the preservative they were using. I have never had this problem with Hypotears, so I seek them out, although they are sometimes hard to find. I recommend them.