Which of the following is a common symptom of improper contact lens wear?

Blurred or distorted vision is a common symptom of improper contact lens wear because various factors can lead to this condition. For instance, if contact lenses are not fitted properly, they may move excessively on the eye surface, causing the vision to fluctuate. Additionally, wearing lenses for longer than recommended can lead to issues such as dryness or hypoxia, both of which can affect clarity. If the lenses have accumulated deposits or are damaged, they can also create obstructions in vision, resulting in blurriness.

It is important to recognize that while increased visual acuity and enhanced peripheral vision might seem appealing, these are not symptoms associated with improper lens wear. Likewise, improved night vision is not a common outcome; rather, improper lens wear can lead to reduced night vision due to sources of glare or haziness from lens-related complications.