Blood like on my right eye

I had this happen to me sometime ago, actually twice with no pain or vision issues, I went to the ER both times and after a thorough examination they couldn’t find anything wrong, they concluded that I had a ruptured blood vessel which bled out into my eye and it cleared up quite fast by the next day. It’s best to watch for any other symptoms but hopefully it won’t bother you again, always get it checked out to be sure if it happens again or you start to feel pain in your eye.