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Bland-Altman style plot33 of the difference between Nott retinoscopy measurements from two instruments, performed by the same examiner as a function of the average of the two measurements. Two examiners (AMC, VM) obtained these measurements from one pre-presbyopic, visually normal adult subject on different days. The mean intraexaminer, interinstrument, intersession repeatability was 0.03 (95% LOA: ±0.76 D).
