• myopia
• secondary school students
• Tanzania

I refer to the interesting article¹ by Wedner et al published recently in the BJO. The authors have concluded, without enough justification, that “an eye screening programme for significant refractive errors is indicated in this population.” I believe more data are required for such a conclusion.

Wedner et al could have reported the true positive predictive rate for the detection of myopia using the stated referral criterion of “worse than 6/12” on the Snellen …