<prompt> Which is not a cause for Hamarlopia?Polar cataractCongenital deficiency of conesPeripheral coical cataractCentral corneal opacity  <response>: Peripheral coical cataract causes Nyctalopia. Central vitreous opacity, Congenital deficiency of cones and Central nuclear or polar cataracts can cause Hamarlopia Day blindness. Ref: A K Khurana, 2nd Edition, Page 11. 