Not sure about during the entire session but at the beginning it could add to the fantasy.  

She opens the door wearing just a mans dress shirt, hair tied up and the librarian glasses. Let the pony tail loose, head shake to let her hair down, glasses fly off and the one button holding the shirt closed pops open !!!

Just sayin'

as in the case of that Boston south suburban provider whose eyes are no more sexy than those of actress Patricia Routledge (Hyacinth from "Keeping up Appearances") If she could wear sunglasses through the session my imagination could fill in sexy eyes the way it does when I give a sailing lesson