EMPLOYEE WAS RIDING IN A PICK UP TRUCK WHEN HE FELT LIKE THERE WAS SOMETHING IN EYE. LATER, HE LOOKED IN A MIRROR AND IT APPEARED HE HAD A BLISTER IN HIS EYE. HE WAS CHECKED BY A MEDICAL DOCTO R AND AN OPTOMETRIST, GIVEN MEDICATION FOR THE CONDITION AND RETURNED MTO WORK WITHOUT RESTRICTION. THE CAUSE OF THE ONSET REMAINS UNKNOWN.