All of the following may be present in Duane&;s retraction syndrome except
**Core Concept**
Duane's retraction syndrome is a congenital ocular motility disorder characterized by limitation of horizontal eye movements and retraction of the globe upon attempted adduction. This condition is often associated with abnormalities in the development of the oculomotor and abducens nerves, as well as the surrounding orbital tissues.
**Why the Correct Answer is Right**
The narrowing of palpebral aperture in abduction is not a characteristic feature of Duane's retraction syndrome. In fact, patients with this condition typically exhibit widening of the palpebral aperture during attempted adduction due to retraction of the globe. This retraction is a hallmark of the condition and is often accompanied by narrowing of the palpebral aperture in attempted adduction, not abduction.
**Why Each Wrong Option is Incorrect**
**Option A:** Suppression is a common feature of Duane's retraction syndrome, where patients may suppress vision in the affected eye to compensate for the limited movement and to avoid diplopia.
**Option B:** Head turn is a compensatory mechanism often seen in patients with Duane's retraction syndrome, where they turn their head to one side to bring the affected eye into better alignment with the visual target.
**Option D:** Limitation of abduction is a characteristic feature of Duane's retraction syndrome, where patients often exhibit reduced or absent horizontal eye movements, particularly in the abducted position.
**Clinical Pearl / High-Yield Fact**
One key clinical feature to remember in Duane's retraction syndrome is the presence of retraction of the globe upon attempted adduction, which is often accompanied by narrowing of the palpebral aperture. This distinctive retraction mechanism is a critical diagnostic clue for this condition.
**Correct Answer:**
✓ Correct Answer: C. Narrowing of palpebral aperture in abduction