RT Journal Article SR Electronic T1 Smoky solution to pressure problems: Fick's Ophthalmotonometer JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 36 OP 36 DO 10.1136/bjo.2010.199588 VO 95 IS 1 A1 Richard Keeler A1 Arun D Singh A1 Harminder S Dua YR 2011 UL http://bjo.bmj.com/content/95/1/36.abstract AB