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.
Eye infections and inflammations can cause red eyes, as well as other symptoms such as itching, discharge, pain, and blurred vision. If a contact lens wearer does not keep their lenses clean and disinfected, or wears them for too long, they can experience red eyes.t can occur in one or both eyes. Red eye could be due to an illness, injury, eye infections, or other condition such as allergies. Doctors do not tend to take immediate action when a patient comes in with red eyes.