1. Selective outcome reporting matrix: primary outcome 'mean visual acuity'.

	Follow‐up
Study	3 months	6 months	12 months	24 months
Kim 1996	G	reported	reported	F
Freeman 1997	G	reported	F (6 months used)	F
Ezra 2004	reported	reported	reported	reported

Missing outcomes classification adapted from a list provided by Paula Williamson at a Cochrane training workshop on selective outcome reporting bias; Edinburgh, March 2009:
 A: States outcome analysed but only reported that P value > 0.05, i.e. not significant.
 B: States outcome analysed but only reported that P value < 0.05.
 C: Clear that outcome was analysed but insufficient data presented to be included in meta‐analysis or full tabulation.
 D: Clear that outcome was analysed but no results reported.
 E: Clear that outcome was measured (e.g. includes structurally related outcomes) but not necessarily analysed.
 F: States that outcome was not measured.
 G: Not mentioned, but clinical judgement says likely to have been measured.
 H: Not mentioned, but clinical judgement says unlikely to have been measured.
 I: Other (to be specified)