Which of the following are common signs of an improperly fitted contact lens?

Discomfort, redness, and blurred vision are all indicative of issues related to contact lens fitting. When lenses are not properly fitted, they may cause irritation to the eye, leading to discomfort that can manifest as pain or a sensation of something being in the eye. Additionally, an ill-fitting lens can compromise the eye's natural ability to remain hydrated, resulting in redness and potential damage to the corneal surface. Blurred vision can occur if the lens is not centered properly on the cornea or if it moves excessively with blinking, disrupting the light entering the eye. Collectively, these signs highlight the importance of proper fitting to ensure comfort and optimal vision while using contact lenses.