Abstract
WE report here that thyrotrophin (TSH) has a marked influence on ocular refraction in rats. In the clinical experience of one of us (C.C.K.-V.A.), adolescent myopia is not infrequently accompanied by increased height, suggesting a common, possibly hormonal, cause for both phenomena. No data on possible hormonal influences on eye growth or refraction could be found in the literature, but early anatomical studies showed that, during puberty, a growth spurt occurs in the eye after an early post-natal rapid weight increase1–4. In a very detailed study, Weiss2 found relatively less growth of the sagittal eye axis as compared with the vertical and frontal diameters. Non-uniform growth rates along different eye axes might affect refraction.
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