Duane retraction syndrome type I is characterized by which specific pattern of eye movement abnormality?

• A Normal abduction, limited adduction; globe retraction on adduction
• B Limited both abduction and adduction; widening of fissure on attempted abduction
• C Paradoxical innervation of both medial and lateral rectus by CN III
• D Limited abduction, normal adduction; globe retraction and palpebral fissure narrowing on adduction ✓

Explanation

Duane retraction syndrome (DRS) results from aberrant innervation of the lateral rectus by a branch of CN III (instead of CN VI). In Type I (most common, ~75%), abduction is limited or absent while adduction is normal or near-normal. On attempted adduction, co-contraction of both medial and lateral recti causes globe retraction and palpebral fissure narrowing. Type II has limited adduction with globe retraction. Type III has limitation of both movements. The retraction and fissure narrowing on adduction is the hallmark distinguishing DRS from CN VI palsy.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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