Sentence:  Arriving in Brittany, the Woodville exiles found a sallow young man, with dark hair curled in the shoulder-length fashion of the time and a penchant for expensively dyed black clothes, whose steady gaze was made more disconcerting by a <WSD>cast</WSD> in his left eye – such that while one eye looked at you, the other searched for you. 
Meaning of the word marked with <WSD> tags:  A squint.