What is the term for the ability to change the focusing system of the eye and sustain focus?

• A. Accommodative facility
• B. Spatial localization
• C. Stereopsis
• D. Pursuits

Answer: (A)

Accommodative facility is the ability to rapidly change the eye's focusing power and to sustain that focus as you switch between distances. The focusing system, accommodation, adjusts the lens to bring near or far objects into clear view, and facility adds the dynamic aspect—how quickly you can shift focus and maintain clear vision during repeated near–far changes. This skill is particularly important in tasks that require frequent distance changes, like reading and then glancing at a board or computer screen. The other terms describe different visual functions: spatial localization is judging where objects are in space, stereopsis is depth perception from binocular image cues, and pursuits are smooth eye movements used to track a moving target. None involve altering or maintaining the eye’s focusing power.