Certified Paraoptometric (CPO) Practice Exam 2025

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Which muscle's only action is to move the eyes away from the nose?

Inferior Rectus
Lateral Rectus
Superior Rectus
Inferior Oblique

The correct answer is: Lateral Rectus

The muscle that solely functions to move the eyes away from the nose is the Lateral Rectus. This muscle is responsible for abduction, which refers to the movement of the eye outward, away from the midline of the face. When the Lateral Rectus contracts, it pulls the eye laterally, allowing for peripheral vision and helping with eye coordination by allowing each eye to move independently outward. The other muscles listed have multiple actions or facilitate movements that do not exclusively involve moving the eyes away from the nose. For instance, the Inferior Rectus primarily moves the eye downwards, while the Superior Rectus moves the eye upwards. The Inferior Oblique has a complex action that includes elevating and turning the eye outward. Thus, the Lateral Rectus is unique in its singular function of lateral movement, making it the correct answer.