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.
Although infections of the cornea, the clear âwindowâ over the center of your eye, are not common, they can seriously affect your vision. The use of contact lenses contributes to eye infections if worn for extended periods or without proper cleaning. Eye infections often cause redness, irritation, tearing and itchiness.Discharge from the eye and crusting of the eyelid margin are also common symptoms that may cause your eyelids and lashes to feel stuck together when you awaken. You may also experience eye pain and swelling of the tissues around the eye.lthough infections of the cornea, the clear âwindowâ over the center of your eye, are not common, they can seriously affect your vision. The use of contact lenses contributes to eye infections if worn for extended periods or without proper cleaning. Eye infections often cause redness, irritation, tearing and itchiness.