By Sarina Houston. Updated March 01, 2015. Class D airspace surrounds airports that have an operating air traffic control tower, but do not have radar services (or at least are not required to.) Airspace surrounding a Class D airport is only classified as a Class D airport when the tower is in operation.
Page Content. DVIDS is a state-of-the-art, 24/7 operation that provides a timely, accurate and reliable connection between the media around the world and the military serving in Iraq, Afghanistan, Kuwait, Qatar and Bahrain.
1. CORNEAL DIAMETER- HVID OPTOM FASLU MUHAMMED. 2. ï¨ Technique 1: ï¨ Corneal Topographer :use the biometric ruler within the corneal topography software program to measure your patientâs horizontal visible iris diameter (HVID). ï¨ It may be necessary to measure at a 45 degree oblique angle as the topographer may cut off part of the cornea in the horizontal plane.