WordWeb Online

1. Having very keen vision
   "keen-sighted as a cat";
   - argus-eyed, hawk-eyed, lynx-eyed, quick-sighted, sharp-eyed, sharp-sighted
    
2. Capable of seeing to a great distance
   - eagle-eyed, farseeing, long-sighted [Brit], farsighted

See also: presbyopic, sighted