Question

which of the following statements regarding the mechanisms necessary for proper vision is inaccurate?
a eye muscles are correctly coordinated so that both eyes move together.
b the correct amount of light is admitted by the ciliary body.
c light is correctly focused onto the retina by the lens.
d the optic nerve transmits sensory images to the brain.

Explanation:

• Option A: Eye muscles (extra - ocular muscles) are coordinated for binocular vision (both eyes moving together), which is correct for proper vision.
• Option B: The iris (not the ciliary body) controls the amount of light entering the eye by adjusting the size of the pupil. The ciliary body is mainly involved in accommodation (changing the shape of the lens).
• Option C: The lens focuses light onto the retina, which is a key part of the visual process.
• Option D: The optic nerve transmits visual information (sensory images) from the retina to the brain for processing.

Answer:

B. The correct amount of light is admitted by the ciliary body.