Full Idea
That human perception is always a 'seeing as' was the cardinal insight of what Husserl called 'phenomenology'.
Gist of Idea
In phenomenology, all perception is 'seeing as'
Source
Jens Zimmermann (Hermeneutics: a very short introduction [2015], 2 'Husserl's')
Book Reference
Zimmerman,Jens: 'Hermeneutics: very short introduction' [OUP 2015], p.33
A Reaction
I presume that 'cardinal insight' means there is no possibility of Husserl being wrong about this. What's happening before you figure out what it is you are looking at?