There are many different things that can effect the eyes. Please read each of these symptoms to find out what is wrong with your rabbit.

Weepy Eye/Pink Eye

When the eye is watery and appears that the rabbit is crying. Fur is matted below the eyelid and down the cheek.
The best thing to do is to keep the eye clean and apply Terramycin eye ointment 2-3 times a day for a week. Neomycin Polymyxin, or Neobacimyx also works well with this, and can be used on young kits who have "Nest Box Eyes, or Sore eyes." This medicine is almost always used with eye diseases.

Wall Eye/Moon Eye
Glazed or cloudiness to the eyes around the pupil or cornea. Slow to respond to light. This is a genetic defect, and the rabbit should be culled if it is a breeder/showing rabbit. There is no cure for it, it is genetic.
 

Eye Injuries

When you have any eye injury you need to take the rabbit to the vet to have it checked out. Any injury could result in blindness and the rabbit could be in extreme pain. Time and the right medicine may or may not correct this, but it will heal.