What does "ocular motility" refer to?

"Ocular motility" specifically refers to the movement of the eyes. This term encompasses various types of eye movements, including saccades (quick, simultaneous movements of both eyes in the same direction), pursuits (smooth tracking movements), and vergence (the movement of both eyes in opposite directions, such as when focusing on a nearby object).

Understanding ocular motility is essential in optometry as it relates to how well a person can coordinate their eye movements, which is crucial for activities such as reading and tracking moving objects. Each of the other choices pertains to different aspects of vision or visual function, but none accurately captures the broad definition of ocular motility. For instance, color vision is a separate aspect of visual perception, focusing relates to the eye's ability to adjust for distance, and coordination of eye and head movements involves more than just the eyes. Hence, "the movement of the eyes" precisely identifies the essence of ocular motility.