RT Journal Article SR Electronic T1 ERRORS OF REFRACTION JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 313 OP 322 DO 10.1136/bjo.2.6.313 VO 2 IS 6 A1 Elliot, R. H. YR 1918 UL http://bjo.bmj.com/content/2/6/313.abstract AB