IT is well known that the refraction of the eyes may change in the course of a lifetime, but we do not know the reasons and the rhythm that rule such changes of shape and function. The interest of research workers has long been exclusively focused on the question of the origin of short-sightedness. On this there are two opinions: the endogenous theory that considers the germ-plasma as the basis for the development of the eye and its parts, and the exogenous theory that attributes short-sightedness to the observation of close objects and other mechanical factors.
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M. Bucklers (1953) studied this question.