A patient using a contact lens develops a corneal infection. Laboratory diagnosis of acanthamoeba keratitis was established. The following is the best drug for treatment –: (A) Propamidine, (B) Neosporine, (C) Ketoconazole, (D) Polyhexamethylene biguanide
Answer is D. PHMD is the drug of choice. Chlorhexidene is an alternative

"Treatment with PHMB or chlorhexidene is often combined with propamidine and neomycine". — Infections of eye