n. The characteristic of being sightless; blindness.
The Century Dictionary and Cyclopedia
n. The state of being sightless: want of sight.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the state of being blind or lacking sight
Word Usage
"He closed his visionless eyes and tried to imagine the dexterous maneuver he had performed so many times in daylight without the encumbrances of water and pressure, of sightlessness and currents."