myopia empty field

myopia empty field

A condition occurring at high altitudes, while flying in clouds or at night in which the eyes in the absence of a distant object tend to focus onto a position only a few ft away. The focus of the eyes must be constantly changed by scanning objects on the ground as well as clouds and aircraft at some distance.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved