RT Journal Article SR Electronic T1 State Recognition for Sight-Testing Opticians JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 272 OP 274 DO 10.1136/bjo.7.6.272 VO 7 IS 6 YR 1923 UL http://bjo.bmj.com/content/7/6/272.abstract AB