Optometry clinic closure Published April 29, 2011 20th Medical Group Optometry Clinic SHAW AIR FORCE BASE, S.C. -- The 20th Medical Group Optometry Clinic will be closed May 2 to 6 and will re-open May 9 at 7:30 a.m. If you need a color vision test for your flight line driver's license, flight medicine can assist you. Call 895-6746. For medical emergencies, call 911 or seek care at the nearest emergency room. For non-emergencies or routine eye appointments, call 895-2273.