On 17 Jan employee was grinding a piece of metal, a particle went into right eye. EE was wearing safety glasses & face shield. On 18 Jan EE went to ER at 2100 hrs, diagnosed with viral conjunctivitis. On 21 Jan EE went to an eye doctor, as eye was still irritated. Second doctor identified a foreign metal body in right eye. Operator was not notified of injury until 23 Jan 2019.