Correction to: Eye (2011) 25, 449–454; doi:10.1038/eye.2011.12; published online 11 February 2011

Since the publication of the above article, the authors have noted that the reference details of the study by Richard and Park (cited on page 453, second paragraph) are missing. The details are:

Richard JM, Parks MM. Intermittent exotropia. Surgical results in different age groups. Ophthalmology 1983; 90: 1172–1177.

The authors would like to apologise for this error.