Camotero we haven't discussed Sextus Empericus lately so I am going to have to review that.
However I would at first glance expect "object of perception refers to the thing we are looking at, such as the tower at a distance, all the way through the conversation.
Maybe someone reads that differently? The point generally being made in these discussions is that the eyes report simply what they receive and it is our opinion (a separate process) that determines what we surmise. I am not sure is Empericus is saying something else (?)