EMPLOYEE HAD BEEN PERFORMING MAINTENANCE ACTIVITIES INCLUDING DRILLING AND RIVETING. HE BELIEVES THAT METAL SHAVINGS FROM THE DRILLING ACTIVITY FELL ON HIS SHIRT SLEEVES OR HANDS. LATER IN THE SHIFT HE RUBBED HIS EYE AND THAT IS WHEN HE THINKS THE PIECE OF METAL SHAVING WAS FORCED IN HIS EYE. HE WAS USING SAFETY GLASSES.