Which of the following is the drug of choice in the treatment of corneal ulcers caused by filamentous fungi?

Fusarium and Aspergillus are the most common filamentous organisms causing fungal keratitis. The drug of choice for filamentous infection is natamycin. Ref: Comprehensive Pphthalmology By A K Khurana, 4th Edition, Pages 100-1; The Wills Eye Hospital Atlas of Clinical Ophthalmology By William Tasman, 2nd Edition, Page 25.