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 –
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
Propamidine
Neosporine
Ketoconazole
Polyhexamethylene biguanide