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REFERENCE And INSTRUCTION MANUAL OPTEC® 2300 VISION TESTER MODEL AFVT NSN 6540-01-375-9031 STEREO OPTICAL CO., INC. 8623 W. Bryn Mawr Avenue, Suite 502, Instruction Manual Optec Vision TesterREFERENCE And INSTRUCTION. MANUAL OPTEC 2300 VISION Learn more. Automated Surface Observing System (ASOS) Since the Reference and Instruction Manual. Optec¨ Vision Tester. 8623 W. Bryn Mawr Ave., Suite 502, Chicago, IL 60631 USA 1.773.867.0380 or 1.800.344.9500. The Optec 2300 Vision Tester (OVT) combines the testing of several visual functions into one piece of equipment. This machine or its predecessor,