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.
Dryness of the contact lenses or the eyes. When dryness is the cause of the blurred vision, the vision usually gets a little clearer immediately after a blink or after putting in a contact lens rewetting drop. So if you havenât blinked in a while, give that a try ya weirdo.