Is commonly treated with a combination of chlorhexidine and polyhexamethylene biguanide.

Acanthamoeba keratitis

Sporotrichosis

Candidiasis

Loiasis

The correct option is : a. Acanthamoeba keratitis

Explanation:

Acanthamoeba keratitis is the infection of the cornea of the eye. This infection is caused by the protozoa Acanthamoeba and can lead to permanent blindness. This disease is very difficult to treat by using conventional medications.

The common medication used in the treatment of this infection is a combination of polyhexamethylene biguanide (0.02% to 0.06% drops) and chlorhexidine (0.02 to 0.2% drops).