title: Survey of systematic reviews and meta-analyses published in ophthalmology.
abstract: OBJECTIVE
  To analyse the types of systematic reviews and meta-analyses published in the field of ophthalmology.
  
  
  METHODS
  The systematic reviews and meta-analysis in ophthalmology published in peer-reviewed journals were retrieved. The distribution of systematic reviews and meta-analyses in various ophthalmic subspecialties, type of study and country of origin were determined.
  
  
  RESULTS
  A total of 533 records were identified as systematic reviews and meta-analysis in ophthalmology. Overall, retina and glaucoma were the two major subspecialties accounting for 35% and 21% of the published systematic reviews and meta-analyses, respectively. The major topics published in retina were age-related macular degeneration (37%), tumours (14%), and diabetic retinopathy (12%). More than half (56%) the systematic reviews and meta-analyses were interventional. The author affiliations of these studies were largely from the USA (30%) and the UK (22%). About 60% of the systematic reviews and meta-analyses were published in ophthalmology journals, followed by the Cochrane Library (15.75%) and other non-ophthalmic journals (25.14%), respectively. The number of publications increased from 3 per year in 1994 to almost 100 per year in 2010.
  
  
  CONCLUSIONS
  The number of published systematic reviews and meta-analyses has been increasing progressively over the past few years. Retina and glaucoma are the two most commonly published topics. Non-ophthalmology journals form a sizeable proportion of avenues for ophthalmic publications.
authors.affiliation: Joint Shantou International Eye Center, Shantou University & The Chinese University of Hong Kong, Shantou, China.
authors.forename: Haoyu
authors.initials: H
authors.lastname: Chen
authors.forename: Vishal
authors.initials: V
authors.lastname: Jhanji
mesh_terms: D015706:Bibliometrics; D006801:Humans; D015201:Meta-Analysis as Topic; D009885:Ophthalmology / Q000706:statistics & numerical data*; D011643:Publishing / Q000639:trends*; D012196:Review Literature as Topic