Ocular refraction and the shadow test . r and more correct term would be a zveak sighted eye, because itis lacking in sufficient refraction. MYOPIA. In giving a definition of Myopia, the same basis will be used as indefinins Hypermetropia. Accordingly :-- The Myopic eye possesses equal refraction in every meridian, butthe retina is situated beyond the principal focus of its refracting system. It will be seen, by comparison of the definition of myopia withthat of hypermetropia, that they are just the opposite. In describing myopia, Landolt speaks of it as axial myopia, indi-cating that in the m
Ocular refraction and the shadow test . r and more correct term would be a zveak sighted eye, because itis lacking in sufficient refraction. MYOPIA. In giving a definition of Myopia, the same basis will be used as indefinins Hypermetropia. Accordingly :-- The Myopic eye possesses equal refraction in every meridian, butthe retina is situated beyond the principal focus of its refracting system. It will be seen, by comparison of the definition of myopia withthat of hypermetropia, that they are just the opposite. In describing myopia, Landolt speaks of it as axial myopia, indi-cating that in the majority of the cases, that the axial length of theeye, along its antero-posterior diameter, is too great. Tschcrning also makes use of the terms axial myopia and axialhypermetropia, and states that a departure of one millimeter in lengthfrom emmetiopia requires two and a half dioptres of correction. Ac- I cording to this rule, one may estimate the abnormal lengthening ofa myopic eye. Myopia, represented by dare brought to a focus in ti. eye. Parallel rays of lightrcle passing through the principal The correction of Myopia is a concave spherical lens of such poivei\that couthincd ivith the refracting system of the eye, their principalfocus ivill be upon the retina.
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