Which is not a cause for Hamarlopia?: (A) Polar cataract, (B) Congenital deficiency of cones, (C) Peripheral coical cataract, (D) Central corneal opacity
Answer is C. 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.