Some causes of red eyes can even lead to vision loss.Red or bloodshot eyes occur when small blood vessels on the surface of the eye become enlarged and congested with blood. Red eyes alone are not ...

This immune response can affect the blood vessels in your eyes, turning them red. If allergies are causing your eye redness, you'll typically also experience symptoms like nasal congestion and ...

A broken blood vessel in the eye—called subconjunctival hemorrhage—causes a red spot on the white part of your eye. It is a ...