Table 1. Articles included in the review and their source.

Database	Articles identified
HTA	Carlton et al1
CINAHL	Carlton et al1
DARE	Schmucker et al2, 3
SCI and SSCI	Carlton et al,1 Schmucker et al,3 Birch et al,4 Holmes et al,5, 6 Loudon et al,7 Sabri et al,8 van de Graaf et al,9, 10 Vianya-Estopa et al,11 Webber et al12
CRCT	Holmes et al,5, 6 Cole et al,13 Göransson et al,14 Hrisos et al,15 Loudon et al,16, 17, 18, 19 Newsham,20 Pediatric Eye Disease Investigator Group Writing Committee,21 Pediatric Eye Disease Investigator Group,22 Roefs et al23
Ovid	Carlton et al,1 Schmucker et al,2, 3 Holmes et al,5 van de Graaf et al,9, 10, 30 Vianya-Estopa et al,11 Webber et al,12 Cole et al,13 Felius et al,24 Koklanis et al,25 Packwood et al,26 Rahi et al,27 Searle et al,28 Searle,29 Choong et al,31
Carlton et al1	Newsham,20, 37 Pediatric Eye Disease Investigator Group,22 Packwood et al,26 Rahi et al,27 Searle et al,28 van de Graaf et al,30 Choong et al,31 Parkes,32 Chua and Mitchell,33 Dixon-Woods et al,34 Horwood et al,35 Leach,36 Williams et al38
Schmucker et al2	Carlton et al,1 Hrisos et al,15 Horwood et al34
Schmucker et al3	Pediatric Eye Disease Investigator Group,22 Packwood et al,26 Chua and Mitchell,33 Horwood et al,35 Williams et al38

Abbreviations: NHS EED, NHS Economic Evaluation Database (0 identified)

CMR, Cochrane Methodology Register (0 identified)

HTA, Health Technology Assessment database (1 identified)

CRCT, Cochrane Register of Controlled Trials (0 identified)

DARE, Database of Abstracts of Reviews of Effects (2 identified)

CDSR, Cochrane Database of Systematic Reviews (0 identified)

CINAHL, Cumulative Index to Nursing and Allied Health Literature (1 identified)

SCI and SSCI, Science Citation Index and Social Sciences Citation Index (5 identified).

Ovid, Medline; PsychINFO; AMED (Allied and Complementary Medicine); British Nursing Index and Archive; and Econlit (17 identified).

Scopus; 0 identified.