Arab Board Ophthalmology Clinical & Oral Practice Questions - Arab Board Ophthalmology Final Clinical And Oral Examination (ABHS) Exam

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On postoperative day 1 after uneventful phacoemulsification, a patient presents with marked limbal-to-limbal corneal edema, 4+ anterior chamber cells with a sterile hypopyon, and an intraocular pressure of 32 mmHg. The patient reports minimal pain and intact light perception. Which feature best distinguishes Toxic Anterior Segment Syndrome (TASS) from infectious acute postoperative endophthalmitis?

Onset within 12 to 24 hours postoperatively and limbal-to-limbal corneal edema with preserved vitreous clarity Onset between 3 to 7 days postoperatively with severe ocular pain Marked vitreous opacities with dense cellular debris on B-scan ultrasonography Rapid clinical improvement following intravitreal vancomycin and ceftazidime

Correct Answer:

Onset within 12 to 24 hours postoperatively and limbal-to-limbal corneal edema with preserved vitreous clarity

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