RT Journal Article SR Electronic T1 Night-blindness JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 258 OP 258 DO 10.1136/bjo.3.6.258 VO 3 IS 6 YR 1919 UL http://bjo.bmj.com/content/3/6/258.1.abstract AB