Which is not a cause for Hamarlopia?
Polar cataract
Congenital deficiency of cones
Peripheral coical cataract
Central corneal opacity
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.