Skiascopy a Treatise On the Shadow Test in Its Practical Application to the Wo
Skiascopy a Treatise On the Shadow Test in Its Practical Application to the Wo
George Adelmer Rogers
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S, or . 4 + . Ii = . 51 in. Posterior to r. This is a trifle posterior to the center of curva- ture of the eye ball. This center changes considerably in dynamic refraction, both on account of the advance of . Y toward r, and because of the increased curvature and shortened radius of s. The center of curvature of t is anterior to /. With a radius of curvature of 6 mm. Or . 24 in, it is of course . 24 in. Forward of t. But the cornea is but . 255 in. Forward of t, hence the center of curvature of... t would be but slightly posterior to r. In the computation of above w^e determined the radius of curvature of t to be . 346, which would place its center of curva- ture anterior to r, but a more accurate calculation would prob- ably place it very near r and slightly posterior to it. But in the calculation of the effect of each dioptric surface we have the data for locating each potential focus. The po- tential focus of the wave after refraction by r ( — ^2 Cm. ) is, as shown, 40/33 = 1. 21 posterior to r, or 1.
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