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.
What is cloudy vision? Cloudy vision is the loss of visual acuity or a blurring of visual perception that can affect one or both eyes. You may experience cloudy vision as a haziness or lack of clarity in your eyesight. It can be constant or intermittent, and one or both eyes can be affected. Cloudy vision may also dull your color perceptions, and it is often accompanied by glare or halos around lights. Cloudy vision may result from simple, harmless causes, such as discharge from the eyes or tearing, or it may result from serious causes such as acute glaucoma, vascular occlusions, or trauma to the eye. Although the term cloudy vision is sometimes used to describe blurred vision, these two changes in vision are slightly different.