. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. tion at the anterior surface hx, directed to h, the rays o b, and o cto k. Consequently k and o are the conjugate foci by refraction on the 48 DIOPTRICS OF THE EYE. surface \ ; k and o those for refraction on the surface h2. Both are cal-culated according to the formula 3c; it is therefore sufficient to applythis formula to one of the two surfaces. For the anterior surface of the lens (Fig. 2G) hx $ is = F, 7i, $ = Fand h, o=/. For hx k=f we now find Fig. 28. Fig. 26. n *i Fig. 27

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. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. tion at the anterior surface hx, directed to h, the rays o b, and o cto k. Consequently k and o are the conjugate foci by refraction on the 48 DIOPTRICS OF THE EYE. surface \ ; k and o those for refraction on the surface h2. Both are cal-culated according to the formula 3c; it is therefore sufficient to applythis formula to one of the two surfaces. For the anterior surface of the lens (Fig. 2G) hx $ is = F, 7i, $ = Fand h, o=/. For hx k=f we now find Fig. 28. Fig. 26. n *i Fig. 27.

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