Certified Paraoptometric (CPO) Practice Exam 2025

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What is the primary function of the superior rectus muscle?

  1. Rotate the eye up and outward

  2. Turn the eye downward

  3. Move the eye upward

  4. Move the eyes away from the nose

The correct answer is: Move the eye upward

The primary function of the superior rectus muscle is to move the eye upward. This muscle is one of the six extraocular muscles that control eye movement, and it specifically elevates the eyeball. In addition to moving the eye upward, it also assists with adduction (moving the eye towards the nose) and intorsion (rotating the top of the eye toward the nose), but its main role is to elevate. Thus, the correct answer identifies the muscle’s key action in the context of eye movement.

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