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.
And the water in swimming pools can change the way your lenses fit, making them too tight and causing red eyes, contact lens discomfort and possible eye health problems. So, either take your contacts out for swimming or wear goggles. Better safe than sorry. â Dr. Dubow.