What does strabismus refer to?

Strabismus refers specifically to the misalignment of the eyes, where both eyes do not properly align with each other when looking at an object. This condition can manifest as one eye being focused while the other eye may turn inward, outward, upward, or downward. Strabismus can lead to issues with depth perception and can affect visual acuity if not addressed.

Understanding strabismus is crucial, especially in the context of optometry, as it can impact a person's overall vision and quality of life. Accurate diagnosis and management, including behavioral therapies, corrective lenses, or surgery, may be necessary to realign the eyes and improve visual function.

The other choices do not describe strabismus: the ability to see without glasses pertains to vision quality rather than eye alignment, while an infection of the eyelid refers to conditions like blepharitis. Cataract formation relates to clouding of the lens of the eye, distinct from any issues of alignment. Hence, the correct choice clearly identifies the nature of strabismus as a misalignment of the eyes.