You need to go to the doctor about the yellow eye to make sure it's not jaundice. The cause of which is vast. But it needs to be seen to, not sat on. It might not even be jaundice, but you need a doctor to tell you that.

Thankyou 

Thankyou 

If it's just in the one eye, it could be a burst blood vessels. Those can be yellow too, just like a bruise. After all, PV can cause capillaries to burst, so that makes sense too. Jaundice usually happens in both eyes, so if it's just the one, it could just be nothing, but yeah, do get it checked out just in case.