Pradeep A, Proudlock FA, Awan M, Bush G, Collier J, Gottlob I. An educational intervention to improve adherence to high-dosage patching regimen for amblyopia: a randomised controlled trial. Br J Ophthalmol 2014;98:865–870. The authors of this article should have acknowledged Huib Simonsz and colleagues from Rotterdam who designed and manufactured an occlusion-dose monitor (ODM) prior to the monitor discussed in this study.