The patient was given Neomycin Polymyxin HC and instructed to use it in his left eye four times daily. What are the long-term effects of using this medication in the eye? So far, his sight is blurred and some minor irritation has occured. He was told to discontinue and given an eye drop to use. Should he follow up with a specialist? He was taking radiation treatments and this was the original cause of the eye irritation.