The Faden operation (posterior fixation suture) acts on an extraocular muscle primarily by:
- A Strengthening the muscle in primary position
- B Detaching the muscle and reattaching it closer to the limbus
- C Weakening the muscle selectively in its field of action while leaving primary position alignment largely unchanged ✓
- D Denervating the muscle through chemical neurolysis
Correct answer: C. Weakening the muscle selectively in its field of action while leaving primary position alignment largely unchanged
Explanation
A non-absorbable suture fixes the muscle belly to the sclera well behind its insertion, creating a new functional insertion point. Rotations into that muscle's field of action are markedly reduced, but primary position alignment is barely altered because the arc of contact changes little there. It is classically added to bimedial recession in nystagmus blockage syndrome and in high AC/A esotropia with persistent near deviation.
Reference: Khurana Comprehensive Ophthalmology, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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