MONOCHROMATIC ABERRATIONS AND MYOPIA

The monochromatic aberrations present in the eyes of a group of 21 you ng myopic subjects and 16 young emmetropic subjects were measured alon g the visual axis at three levels of accommodation. The aberrations we re measured using a modified aberroscope technique which makes use of a retinal camera to photograph the shadow image of the aberroscope gri d on the retina, while accommodation levels of 0, 1.5 and 3.0 D were i nduced consensually. Fourth-order aberrations were significantly diffe rent between the emmetropic and myopic groups, with the myopes showing lower fourth-order terms. A high proportion of the aberroscope grids photographed in the myopic eyes were too highly aberrated to permit an alysis.