Table 1.

An overview of the two arms of the trial.

	Intervention arm	Comparator arm
Age group	11–15 years	11–15 years
Screening method	Peek Acuity	Standard ETDRS chart
Screening VA level	<6/9.5 in one or both eyes	<6/9.5 in one or both eyes
Health education	•  PeekSim images for classroom teaching by field workers, after sensitization and orientation i.e. for all children	None
	•  Eligible children selected a PeekSim image of their choice from a range of pre-tested images to take home to show their parents, with wording in the relevant local language
	•  Personalized voice messages for parents in the relevant local language
Data collection	Entered directly into Peek Solutions software using tablets
Refraction	Trained optometrist
Prescribing criteria	VA improves by 2 or more lines tested binocularly
Frame types	A range of different coloured plastic frames
Selection of frames	Children selected their preferred frame
Delivery of spectacles	Delivery of free spectacles to schools within 2 weeks by trained field workers, and VA re-tested with correction
Assessment of primary outcome	Observation during unannounced visits 3–4 months after spectacles were delivered