1) Ability to see 2) It needs some perspective 3) Optometry concern 4) Seeing 5) Sight 6) Sightedness 7) The act or fact of seeing 8) Use of the faculty of vision 9) Vision 10) Visual modality 11) Visual sense 1) Sightedness 2) Vision 
• (n.) Sight of the eye; the sense of seeing; view; observation.
Eye'sight` noun Sight of the eye; the sense of seeing; view; observation. « Josephus sets this down from his own eyesight .» Bp. Wilkins. 
[n] - use of the faculty of vision
seeing 1 sightedness noun normal use of the faculty of vision
the power or faculty of seeing. · the act or fact of seeing. · the range of the eye: to come within eyesight.