Sentence:  "Glasses (perspicua) can be so constructed that objects at a very great distance appear to be quite close at hand, and <WSD>conversely</WSD>." Thus we read the smallest letters from an incredible distance, number objects, however small, and make the stars appear as near as we wish. … Also objects can be made to appear so that the greatest seems the least, and <WSD>conversely</WSD>; what are high appear low and short, and <WSD>conversely</WSD>; and what is hidden appears manifest. … [translation of w 
Meaning of the word marked with <WSD> tags:  With a reversed relationship.