The sudden appearance of a blood-red patch on the eye is most commonly a subconjunctival hemorrhage. This occurs when a small blood vessel breaks just beneath the conjunctiva, the clear surface of the eye, causing blood to pool and create a red spot.
Despite its alarming appearance, a subconjunctival hemorrhage is usually harmless and does not affect vision. These hemorrhages can range in size from a small dot to covering a large portion of the white of the eye. They often resolve on their own without treatment, typically within one to two weeks.
2. Why Subconjunctival Hemorrhages Look So Scary but Rarely Are Dangerous
The conjunctiva contains numerous tiny blood vessels that can break easily. When they do, the blood becomes trapped under the clear conjunctiva, resulting in the characteristic red appearance. The eye’s white sclera provides a stark contrast, making the blood appear more pronounced and alarming.
However, these hemorrhages are usually painless and do not lead to any lasting damage or vision impairment. They are similar to a bruise on the skin and will eventually be reabsorbed by the body.