Certified Paraoptometric Practice Test

Which muscle has direct control over the focusing ability of the eye?

1. Choroid

2. Ciliary

3. Macula

4. Fovea centralis

The correct answer is: Ciliary

The ciliary muscle is responsible for regulating the curvature of the lens in the eye, which in turn affects the focusing ability of the eye. The choroid is a thin membrane that provides nourishment to the retina, but it does not directly control the focusing ability of the eye. The macula is a small area on the retina that is responsible for central vision, but it does not have direct control over the focusing ability of the eye. The fovea centralis is a depression in the macula and is responsible for sharp, detailed vision, but it does not have direct control over the focusing ability of the eye. Therefore, B is the correct answer as it is the only muscle that has direct control over the focusing ability of the eye.