What Is Ocular Motility?

How Ocular Motility Works?

The six muscles in each eye work together in pairs to achieve coordinated movement. For example, the lateral rectus pulls the eye outward, and the medial rectus pulls the eye inward. The brain sends precise signals to ensure both eyes aim at the same target, allowing the brain to fuse the images into a single, three-dimensional view.

Types of Eye Movements

Eye movement is categorized by its purpose:

• Saccades - Rapid, jumpy movements used when the eye shifts quickly from one point of fixation to another, such as when reading.
• Pursuits - Smooth, slower movements used to track a moving object, such as following a ball.
• Vergences - Movements where the eyes turn inward (convergence) or outward (divergence) to maintain focus at different distances.

Testing Ocular Motility

Eye doctors test ocular motility by having the patient follow a target in various directions, often described as following an "H" pattern. This test checks for weakness, overaction, or misalignment in any of the extraocular muscles, which can cause double vision.

Ocular Motility and Vision

Poor ocular motility leads to problems like strabismus (eye turn) or difficulty maintaining single vision. If the eyes cannot aim together, the brain may suppress the image from one eye, disrupting depth perception and causing fatigue.