the mean rate of change of refractive error for the experimental group was ( minus indicating increase of myopia ) -0.49 d/year ( range , +0.37 to -1.95 d/year ) on retinoscopy and -0.52 d/year ( range , +0.21 to -1.32 d/year ) on subjective refraction .
C0034951
refractive error
C0027092
myopia