Nyctalopia and hemeralopia are the rare examples of words that may lead to a good deal of controversy and confusion among doctors of different linguistic backgrounds, because of different definitions and meanings. Nyctalopia is a word from the Greek medical antiquity, defined as “night blindness” or defective dark adaptation.¹ Hemeralopia is a word that originated in the 18th century, which means “day blindness” or visual defect characterised by the inability to see as clearly in bright light as in dim light.^2,3 Standard English dictionaries also conform with the meanings of nyctalopia and hemeralopia as night blindness and day blindness, respectively. However, …