EMPLOYEE WAS WORKING UNDER A PROCESS VESSEL. THE VESSEL WAS OUT OF SERVICE FOR CLEANING PURPOSES. THE EMPLOYEE WAS IN THE PROCESS OF INSTALLING THE BOTTOM SECTION OF THE VESSEL WHEN A DROP OF CAUSTIC DROPPED INTO THE EMPLOYEE'S LEFT EYE. PRESCRIPTION MEDICATION WAS PRESCRIBED, MAKING THIS A RECORDABLE INJUJURY. NO LOST TIME OR RESTRICTED DUTY.