Causes of refraction changes: a classification.

This classification of refraction changes suggests new and early approaches to the treatment of complications of myopia. By appreciating the ultrasonic work on accommodation by Coleman, The field is opened for a fresh study of such diseases as macular degeneration; diseases of the vitreous, even glaucoma; cataracts; and retinal detachments. Other diseases of the retina for which the causes are obscure may be viewed for possible help, if not a cure.