Sentence:  In Q<sub>2</sub>, he marks his departure from alternative <WSD>constatation</WSD> of fact (“Either love has put eyes in my head that have not true "sight", or they "see" truly, but my judgment is amiss”) to social speculation by avoiding the "see" of visual perception in favor of the words "eyes dote" and "love's eye", which clearly denote not simple perception but biased judgement. 
Meaning of the word marked with <WSD> tags:  An assertion; a proposition assumed for the sake of argument, an axiom.