 Upon examination of the fundus of his left eye, a narrow, white, motionless, and linear lesion of 6–7 mm was found.He was then treated with a second course of DEC (400 mg daily in two doses for eight days, after a three-day dosage increase), and by the end of treatment, he did not have pruritus, but his visual impairment was unchanged.The "M. perstans" burden was significantly reduced, and the peripheral eosinohpil count decreased to 1%.