What causes an eye to go bloodshot?

Answer:
Eyes have a bloodshot appearance when the blood vessel capillaries near the surface of the sclera (white portion of eye) become irritated and enlarged. There are several different reasons this may occur from dry air to contact lenses to activity creating excessive pressure in eye area.
First answer by Amanda Cochran. Last edit by Amanda Cochran. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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