I agree, the vet is the first option if you get their quickly and can afford that. But cleaning the eye and getting antibiotics in it could mean the difference between sight and no sight. While blood in the eye could be from a brain injury, it's often from a bang on the eye. I have had three eye bleeds in my two doxies who are micro eyed, and blind completely in one eye - including mysef- and the arnica dramatically removes the blood from the eye and remember it is vital to prevent infection if there's a chance of vision - so vet first, if one can't do that as many can't or don't have one or it would take too long to get to one for a visit, rinse the eye and do the antiobiotic (no steroids) and arnica - eyes can heal fast if there are scratches (often in 24 hours if no infection sets in - I had this with a ferret (and my son who scratched his cornea with his own nail) that the vet said would most likely go blind from a scratch in the eye - but with constant application every few hours of an antibiotic salve (not easy on a ferret) over 24 hours, day and night - it healed perfectly - after writing this, I realize we've had plenty of eye issues over the years across the human, fur and feather populations!