Certified Paraoptometric (CPO) Practice Exam 2025

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What does the inferior oblique muscle primarily do?

  1. Turns the eye upward

  2. Moves the eyes towards the nose

  3. Rotates the eye down and inward

  4. Rotates the eye up and outward

The correct answer is: Rotates the eye up and outward

The inferior oblique muscle primarily rotates the eye upward and outward. This action occurs when the eye is in a position where it is looking inward (adducted), and the contraction of the inferior oblique muscle causes a combination of upward motion and lateral rotation. It plays a significant role in the overall movement of the eye, especially in allowing for proper vision and alignment when looking at objects that are above and to the side. The muscle's role can be particularly observed when engaging in tasks that require looking up while the eye is also turned inward, demonstrating its function in providing both elevation and lateral movement. Understanding the specific actions of extraocular muscles like the inferior oblique is crucial for recognizing how they contribute to the complex mechanics of eye movement.

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