As of 2015, doctors and scientists are not certain about what causes blisters on the eyes. Observational research suggests that excess exposure to ultraviolet light may contribute to some types of eye blisters, according to WebMD.
Two types of eye blisters, pinguecula and pterygium, tend to appear in patients who experience frequent exposure to UV light, dust and wind, or who suffer from chronic dry eye, as WebMD notes. Pinguecula blisters appear commonly in the elderly, while pterygium blisters are most common in adults aged 20 to 40. Pterygium is sometimes called surfer's eye because it frequently affects surfers.
Pterygium blisters are a type of eye blister that tends to appear as a clump of tiny, clear lesions on the surface of the eye. This type of blister tends to be benign and painless, but the blisters may cause temporary changes in the patient's vision as well as a feeling of a foreign body in the eye, as WebMD explains.
Pinguecula blisters manifest as small bumps on the clear membrane covering the surface of the eye, known as the conjunctivia. The bump is usually filled with a combination of protein, fat and calcium, according to Healthline. Pinguecula are also benign, but these blisters may cause more discomfort than pterygium blisters.
A doctor may prescribe a vasoconstrictor to combat an eye blister, as WebMD details. Steroid eye drops are another common treatment.