Certified Paraoptometric (CPO) Practice Exam 2026

The term that describes the ability of the two eyes to function together effectively is binocular vision. This involves the coordination of both eyes to create a single, three-dimensional image, which is essential for depth perception and understanding the spatial relationships of objects. When both eyes work in conjunction, the brain combines the slightly different images received from each eye to enhance visual acuity and depth perception.

Monocular vision refers to the use of one eye, which limits depth perception and the perception of three-dimensional space. Depth perception is a specific aspect of vision that allows us to judge distances and the relative position of objects, but it is a result of the functioning of both eyes. Peripheral vision pertains to the awareness of what is happening outside of the direct line of sight, which does not require both eyes to be working together effectively. Therefore, the most accurate description of the effective functioning of both eyes is binocular vision.