One-eyed means having only one working eye. A one-eyed cat, a one-eyed pirate, one-eyed and undaunted.
Depth perception goes, though the brain compensates surprisingly well within a few months. One-eyed is also used of a biased view that sees only one side of anything.
1adjectiveone-eyedHaving only one working eye.
“The one-eyed dog managed the stairs perfectly well.”
one-eyed is a quality.
Old English aneged, one plus eyed; the compound has been in English for over a thousand years.
Proto-Germanic
*ainaugidaz
Old English
ānēġed — one-eyed
Middle English
oneyed
English, today
one-eyed
From Middle English oneyed, on-eied, on-eiȝed, from Old English ānēġed (“one-eyed”), from Proto-Germanic ainaugidaz, equivalent to one + eyed. Compare Old English ānīeġe (“one-eyed”), Scots ane-eit, aan eet (“one-eyed”), stq eenooged (“one-eyed”), West Frisian ieneagich (“one-eyed”), Dutch eenogig (“one-eyed”), German einäugig (“one-eyed”), Danish enøjet (“one-eyed”), Swedish enögd (“one-eyed”), Icelandic ein-eygður, ein-eygur (“one-eyed”).
Etymology from Wiktionary, CC BY-SA