In Duane's Retraction Syndrome Type 1 is most associated with which limitation?

In Duane's Retraction Syndrome Type 1 is most associated with which limitation?

• A. Abduction deficit
• B. Adduction deficit
• C. Vertical movement deficit
• D. Convergence deficit

Answer: (A)

Duane Retraction Syndrome Type I is defined by a primary limitation in moving the eye outward (abduction). This occurs because the lateral rectus is misinnervated, often receiving anomalous input from the oculomotor nerve, which disrupts normal horizontal gaze. In this type, the eye struggles to abduct when looking to the affected side, and you may see globe retraction or a narrowed palpebral fissure when attempting to gaze inward due to co-contraction of the horizontal muscles. The most characteristic finding is the prominent abduction deficit, with adduction typically better preserved. Other limits don’t fit this pattern as well: an adduction deficit would imply weakness of the medial rectus or another mechanism affecting inward movement; a vertical movement deficit points to problems with the vertical gaze muscles rather than the horizontal miswiring seen in Duane; a convergence deficit concerns near focus misalignment, which isn’t the hallmark of this syndrome.

Duane Retraction Syndrome Type I is defined by a primary limitation in moving the eye outward (abduction). This occurs because the lateral rectus is misinnervated, often receiving anomalous input from the oculomotor nerve, which disrupts normal horizontal gaze. In this type, the eye struggles to abduct when looking to the affected side, and you may see globe retraction or a narrowed palpebral fissure when attempting to gaze inward due to co-contraction of the horizontal muscles. The most characteristic finding is the prominent abduction deficit, with adduction typically better preserved.

Other limits don’t fit this pattern as well: an adduction deficit would imply weakness of the medial rectus or another mechanism affecting inward movement; a vertical movement deficit points to problems with the vertical gaze muscles rather than the horizontal miswiring seen in Duane; a convergence deficit concerns near focus misalignment, which isn’t the hallmark of this syndrome.