RT Journal Article SR Electronic T1 ON TONOMETRIC VALUES JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 293 OP 300 DO 10.1136/bjo.3.7.293 VO 3 IS 7 A1 Priestley Smith YR 1919 UL http://bjo.bmj.com/content/3/7/293.abstract AB