I'm not so certain that the issue is the definition of the term normal, so much as it is the value (positive or negative) or association (healthy vs. unhealthy) the term implies in a medical or social context.
One of the most common reasons for blurry vision while wearing contacts is that your eyes are dry. Some people have a medical condition that causes dry eyes, called dry eye syndrome, but others' eyes are irritated by the contacts themselves.
But you should see your GP if your itch: 1  is severe. 2  lasts for a long time. 3  keeps coming back.  is associated with other symptoms â such as redness and swelling, or yellowing of the skin and whites of the eyes 1  (jaundice) is all over your body, with no obvious cause.