The characteristic of being sightless; blindness.(noun)
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Use "sightlessness" in a sentence
"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."
"Jason was at her side before she realized it, as if he understood all too well her fear of sightlessness-of course, he had been only a few feet away, and no longer needed to worry about erasing the chalk-marks by striding directly across to her."
"His eyes seemed to possess the frosted blue sightlessness of a man with severe cataracts."