Arab Board Ophthalmology Final Written Practice Questions - Arab Board Ophthalmology Final Written Examination Exam

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A 24-year-old soft contact lens wearer presents with excruciating right eye pain out of proportion to clinical signs, photophobia, and blurred vision after rinsing lenses with tap water. Slit-lamp biomicroscopy reveals radial perineural infiltrates and patchy stromal opacities. In vivo confocal microscopy identifies double-walled hyperreflective polygonal cystic structures. What is the first-line topical antimicrobial therapy for this condition?

Topical natamycin 5% suspension alone Topical polyhexamethylene biguanide (PHMB 0.02%) or chlorhexidine 0.02% Topical ganciclovir 0.15% gel alone Topical moxifloxacin 0.5% monotherapy

Correct Answer:

Topical polyhexamethylene biguanide (PHMB 0.02%) or chlorhexidine 0.02%

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