Blood vessels in the eye become blocked and leaky, getting in the way of light passing to the retina. (politics.co.uk)
I got hit in the face one day (walked by the wrong place at the wrong time) and ended up with a broken blood vessel in my eye. (zillow.com)
Summary: Use of eye injections of drugs aimed at slowing the growth of abnormal blood vessels in the eye is becoming more common for the treatment of individuals with many eye problems including macular degeneration, diabetic retinopathy and retinal artery or vein blockage. (glaucoma.org)