RT Journal Article SR Electronic T1 Presence of free radicals in commonly used ophthalmic preparations JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 525 OP 526 DO 10.1136/bjo.2009.162495 VO 94 IS 4 A1 Lockington, David A1 Macdonald, Elisabeth A1 Gregory, Marilena A1 Stewart, Philip A1 Caslake, Muriel A1 Ramaesh, Kanna YR 2010 UL http://bjo.bmj.com/content/94/4/525.3.abstract AB