What is a sign of sub-conjunctival hemorrhage?

Sub-conjunctival hemorrhage is characterized by the presence of blood pooling beneath the conjunctiva, which is the clear membrane covering the white part of the eye. This accumulation of blood typically occurs due to leakage from small blood vessels, often triggered by trauma, sudden increases in pressure such as coughing or straining, or without an identifiable cause.

When observing a sub-conjunctival hemorrhage, the most apparent sign is indeed the visible blood beneath the conjunctival tissue, which can create a distinct red or dark patch on the surface of the eye. This pooling of blood often does not cause any pain or significant vision changes, although it may appear alarming.

While other symptoms like swelling of the eyelid or redness in the sclera may accompany various eye conditions, they are not specific indicators of sub-conjunctival hemorrhage. Additionally, blurred vision can be related to numerous ocular issues but does not directly correlate with sub-conjunctival hemorrhage, since this condition typically does not affect visual acuity. Thus, the distinct pooling of blood under the conjunctiva stands as the hallmark sign of this condition.