Emp was cleaning area around and under conveyor/tailpulley with shovel. The conveyor was operating. EE allowed shovel to become engaged with conveyor belt/pulley. Emp got off balance and hit left eye on 2"" diameter 2' long pipe on conveyor frame. Emp completed shift. Did not report for work on 5/13 due to swelling in left eye. Returned to work on 5/14. Eye is fine.