I found this link to be quite good, going into great detail re: different medications to alleviate symptoms. Recommended reading.

Excellent article about eye allergies. First the article focuses on prevention. It's broken down by allergen and gives you many, many tips for avoidance. Then it says if avoidance isn't an option, move on to medicines. It also breaks down the medicines by type and has a really easy to understand chart outlining each medicine, what category it falls into, and comments about how it works and any possible side effects. This article covers it all!