What would be a common symptom of an improperly fitting contact lens?

A common symptom of an improperly fitting contact lens is redness of the eye. When a contact lens does not fit correctly, it can create irritation to the cornea or the surrounding tissues, leading to increased blood flow in the area as a response to the discomfort. This vascular response manifests as redness, which often indicates either a lack of oxygen supply to the cornea (hypoxia) or mechanical irritation from the lens itself.

Increased visual acuity is not typically associated with an improper fit; rather, one would expect visual disturbances or blurriness if the lens does not properly align with the curvature of the eye. Unchanged prescription values do not relate to the fit of the lens but rather refer to the refractive error of the eye, which remains constant regardless of lens fit. Stable lens movement is indicative of a well-fitted lens; a lens that moves too much or not enough can result in discomfort and further complications.