Your cat has vanished from inside the house. He either got outside when you opened the door and you weren't quick enough to catch him, or he
You are likely referring to a common condition called "cherry eye" or prolapsed nictitans. The nictitans is a third eyelid that dogs and cats have. It protects the eye and also has tear producing glands within it. Please refer the this excellent link for detailed information on this topic.http://www.veterinarypartner.com/Content.plx?P=A&A=567


