TY - JOUR T1 - Night vision in a case of vitamin A deficiency due to malabsorption. JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 37 LP - 42 DO - 10.1136/bjo.67.1.37 VL - 67 IS - 1 AU - I Perlman AU - D Barzilai AU - T Haim AU - A Schramek Y1 - 1983/01/01 UR - http://bjo.bmj.com/content/67/1/37.abstract N2 - Night vision was tested electroretinographically and psychophysically in a vitamin A deficient patient before and after therapy. Vitamin A deficiency resulted from malabsorption due to a jeujunoileal bypass operation. Before therapy the patient had severely reduced cone and rod function. After the reversal operation, accompanied by 5 injections of a total of 500,000 units of vitamin A, complete recovery of cone and rod functions was observed within 7 months. Shortly after therapy rod sensitivity reached the normal level, while the time course of rod adaptation remained slower than normal and the dark-adapted electroretinographic (ERG) responses were subnormal. At later stages the ERG responses reached normal amplitudes but rod adaptation stayed slow. Only after 7 months did night vision reach the normal level with regard to the time course of rod adaptation, rod sensitivity, and ERG responses. ER -