That is too vague to offer useful information.
It's like saying "I have chest pain". It could be from doing push-ups yesterday or it could be a heart attack or pulmonary emboli. There are too many causes to give a diagnosis from what the person just said I have chest pain. Your description of your wife's eye could be any of scores of problems. To make a proper diagnosis requires examination with special equipment. Sometimes from the person's description I have a good idea of what it might be. In this case I would be guessing which is not what this forum is about.