What may occur if contact lenses are worn while swimming?

Wearing contact lenses while swimming can indeed lead to a higher risk of eye infections. When lenses come into contact with water, particularly in swimming pools, lakes, or oceans, they can trap bacteria, viruses, and other pathogens against the eye. This is because water can contain contaminants that can easily adhere to the surface of the lenses. If the lenses are not properly disinfected afterward, these pathogens can lead to serious infections, such as keratitis, which is an inflammation of the cornea. Additionally, the lens material can absorb these microorganisms, potentially causing further complications.

Improved vision underwater is not a benefit as contact lenses are not designed to correct vision in that environment, and vision can be distorted when wearing them in water. Enhanced comfort during water activities could be misleading because lenses can cause discomfort or irritation due to the presence of water or pollutants. Lastly, stating that there is no impact on eye health disregards the very real risks posed by wearing contact lenses in aquatic environments. Thus, the primary concern lies in the elevated risk of eye infections, making this the correct answer.