Anne Sullivan Anne Sullivan Johanna Mansfield Sullivan Macy (April 14, 1866 – October 20, 1936), better known as Anne Sullivan, was an American teacher, best known for being the instructor and lifelong companion of Helen Keller. At the age of five, Sullivan contracted trachoma, an eye disease, which left her blind and without reading or writing skills. She received her education as a student of the Perkins School for the Blind where upon graduation she became a teacher to Keller when she was 20. Sullivan was born on April 14, 1866, in Feeding Hills, Agawam, Massachusetts. According to her baptismal certificate, her
Pupil of all wavelengths across the full diameter of the lens, even in bright light. It has also been suggested that in ambush predators such as some snakes, vertical slit pupils may aid in camouflage, breaking up the circular outline of the eye. In a study of Australian snakes, pupil shapes correlated both with diel activity times and with foraging behaviour. Most snake species with vertical pupils were nocturnal and also ambush foragers, and most snakes with circular pupils were diurnal and active foragers. Overall, foraging behaviour predicted pupil shape accurately in more cases than did diel time of activity, because