Red Eyes

EyeSmart Eye Health Information from the American Academy of Ophthalmology

Vision Resources on the Internet

Cataract

Cornea

Diabetic Eye Disease

Eye Infections

Eye Tumors

General Eye Information

Glaucoma

LASIK

Low Vision

Low Vision Evaluation and Rehabilitation

Macular Degeneration

Oculoplastic Surgery and Eyelids

Other Eye Disorders

 

Pediatric Eye Disorders

 

Retina

One of the causes of a red eye is subconjunctival hemorrhage. This happens when a small blood vessel under the conjunctiva breaks and bleeds. A red patch of blood appears on the white of the eye, but causes no pain or change in vision. In some cases, the hemorrhage is caused by coughing, heaving lifting or vomiting. It may also develop following eye surgery or trauma.

While it may look frightening, a subconjunctival hemorrhage is essentially harmless. The blood becomes trapped underneath the clear conjunctival tissue, much like a bruise. No treatment is necessary as the blood naturally reabsorbs within several weeks