Baby call duck with eye problems

My mom got one duck to hatch last thursday. His one eye is all mattered up and she keeps cleaniing it out and it keeps filling back up. His other eye has a film across it and she is sure he is blind in that one. What could have caused this and what can she do for his eye. Other then that he seems healthy, he eats and drinks good. She is wondering if high humidity could of caused it.