Also , there may be Argyll Robertson pupils , which are bilateral small pupils that constrict when the person focuses on near objects , but do not constrict when exposed to bright light .
Late neurosyphilis can also cause Argyll Robertson pupils , which causes a person 's pupils ( the black circles in the middle of their eyes ) to be smaller than usual ; the pupils also constrict ( or get smaller ) when the person focuses their eyes on objects that are close by , but they do not constrict after seeing bright lights , like normal pupils do .