RT Journal Article SR Electronic T1 The Status of Sight-testing Opticians JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 560 OP 561 DO 10.1136/bjo.6.12.560 VO 6 IS 12 YR 1922 UL http://bjo.bmj.com/content/6/12/560.abstract AB