The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for direct vision
Several of the men had peered through the direct-vision ports, playing spotlight beams through them.The Highest Treason
In the control room, Bors watched out of a direct-vision port, giving occasional glances to the screens.Talents, Incorporated
William Fitzgerald Jenkins
A direct-vision spectroscope is like a small telescope with prisms arranged inside the tube.Through Magic Glasses and Other Lectures
Arabella B. Buckley