"But alas! all these unkindnesses and neglects were trivial to the irreparable loss of his eye sight: of which he found a sensible and gradual decay for many years; and therefore was the better enabled to endure it. But about the year 1654. tenebrescunt videntes per foramina [darkly you look through the holes]; those that looked out of the windows were darkened, and he was constrained to make use of other mens eyes (but not in the sense as great persons do) to guide him in the Motions of his Body, tho not in the Contemplations of his Mind."