抄録
(1) Choline hydrochloride per os improves dark adaptation in normal man.
(2) The said effect appears about one hour after the intake and lasts some 5 hours after 2 gm. and 24-31 hours after 3gm. of choline hydrochloride.
(3) There is no side action except for transient and slight salivation after choline hydrochloride intake.
(4) The relationship between the speed of visual purple regenera-tion and the ability of dark adaptation is discussed.
