A study was made to check the reliability of dynamic retinoscopy findings in a modification of the bell retinoscopy technique. The study was to compare findings between two examiners, the authors. Selected subjects in the test sample were retested to determine if the retinoscopy techniques were a variable. One examiner was measuring the light shadow edge of the beam with rather large sweeps of the instrument. The other was measuring the very center of the beam with very small, rapid sweeps of the instrument. The re‐test data confirm that the technique differences could account for at least 3.50 D difference at the 40 cm test distance.
Streff et al. (Sun,) studied this question.