For a blister on the eyeball, also called allergic conjunctivitis, patients can use both prescription and non-prescription eye drops for treatment, notes the American Association for Pediatric Ophthalmology and Strabismus. Sometimes a doctor prescribes steroid eye drops and antihistamine drops to reduce the swelling.
These drops are the most effective when used daily, but some are available for use as needed. For people who cannot tolerate eye drops, oral medications are available to treat a blister on the eye, according to the American Association for Pediatric Ophthalmology and Strabismus. A cold compress is also a useful treatment for this condition.