Table 2

Prespecified primary and secondary outcomes of the Village-Integrated Eye Worker Trial II, assessed at 4 years

OutcomeNote
Primary
 Pinhole visual acuity
  • Measured in logMAR units separately for each eye with the Peek mobile application and a Lorgnette pinhole occluder. Peek measures logMAR visual acuity on a discrete 45-level scale from −0.3 to 4.0.

Secondary
 Cause-specific visual impairment
  • Pinhole acuity worse than logMAR 0.48 (Snellen equivalent 20/60) due to glaucoma, diabetic retinopathy or age-related macular degeneration, as determined by standardised eye examination.

 Bilateral blindness
  • Pinhole Peek Acuity worse than logMAR 1.3 (Snellen equivalent, 20/400) in the better seeing eye.

 Presenting visual acuity
  • Measured in logMAR units separately for each eye with the Peek mobile application and currently available refractive correction, if any.19

 Cost-effectiveness
  • Costs per case of visual impairment prevented, with costs enumerated from a hospital perspective and visual impairment assessed from the final census.