Which mechanism primarily stabilizes visual images during rapid head movements?

• A. Microtremors
• B. OKN
• C. OKR
• D. VOR

Answer: (D)

During rapid head movements, the eyes are stabilized by the vestibulo-ocular reflex. The semicircular canals sense head motion and trigger an equal and opposite eye movement to keep the image steady on the retina. This reflex acts very quickly and with high gain, so even fast head turns don’t blur vision.

Microtremors are tiny fixational eye movements that occur even when trying to hold gaze, not corrective responses to head movement. Optokinetic responses (OKN/OKR) rely on movement of the visual field across the retina and help stabilize vision when the environment itself is moving, not when you’re moving your head rapidly. So the primary stabilizing mechanism for rapid head movements is the vestibulo-ocular reflex.