ABSTRACTOn the basis of routine clinical findings taken on a group of 100 patients serving as subjects in the Houston Myopia Control study, a three-way comparison was made between retinoscopy, subjective, and Dioptron Nova refractive findings. Retinoscopy and subjective findings compared very favorably, mean differences being –0.01 D for spherical equivalent power and –0.05 D for cylinder power. Dioptron and retinoscopy findings differed by –0.30 D for spherical equivalent power and –0.13 D for cylinder power, whereas Dioptron and subjective findings differed by –0.33 D for spherical equivalent power and –0.18 D for cylinder power.