RT Journal Article SR Electronic T1 Long-term follow-up of red-filter treatment of amblyopia. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 613 OP 616 DO 10.1136/bjo.56.8.613 VO 56 IS 8 A1 S R Malik A1 P Singh A1 B K Goel YR 1972 UL http://bjo.bmj.com/content/56/8/613.abstract AB