This paper aims to examine some of Scotus’s key notions on perception in his Commentary on the De anima, focusing on the notions of sense, medium, and object. I will keep two main points of interest at hand: first, Scotus’s understanding and reception of the philosophy of perception advanced by his contemporaries, in light of his own theory of the faculties, objects, and the perfection of their respective acts; second, the distinction and classification of the external senses according to their perfection.