Seeing [defined]

See

[see]
verb (used with object), saw, seen, seeing.

1.
to perceive with the eyes; look at.

2.
to view; visit or attend as a spectator: to see a play.

3.
to perceive by means of computer vision.

4.
to scan or view, especially by electronic means: The satellite can see the entire southern half of 
the country.

5.
to perceive (things) mentally; discern; understand: to see the point of an argument.

6.
to construct a mental image of; visualize: He still saw his father as he was 25 years ago.

7. 
to accept or imagine or suppose as acceptable: I can’t see him as president.

Synonyms
observe, notice, distinguish, discern, behold, regard, .comprehend, penetrate, determine, know, undergo, accompany

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TL;DR

Seeing is not restricted to processing visual information/stimulus. Seeing also constitutes perception and perceived mental imagery.

Seeing depends on context, desire and expectation. Does visual information provided by the eye always yield the same stable interpretation?