Vitamin a is the main component that inspects pigment , lack vitamin a to be able to cause nyctalopia consequently .
维生素Ａ是视色素的主要组成部分，因而缺乏维生素Ａ会引起夜盲症。
Shrimp ! Not only is the drug of marine shrimp , don 't give him in case he , so for other things also , and other allergic to it , mr. but I don 't know him again , for the nyctalopia what medicine .
