Table 2 Repeatability of non-cycloplegic autorefractor data in 345 children aged 7 years, for two visits, 4–6 weeks apart
Refractive componentMean difference dioptres (SD)Repeatability coefficient (1.96*SD)Percentage within ±0.25 DPercentage within ±0.50 DPercentage within ±1.0 D
Mean spherical equivalent (MSE)−0.07 (0.86)±1.69 D52.470.585.9
Sphere−0.05 (0.86)±1.69 D59.374.787.5
Cylinder−0.02 (0.32)±0.63 D82.497.499.7
Anisometropia (MSE)0.003 (0.50)±0.98 D74.889.096.4