. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . nevertheless,sufficient to be visible. 50. The dioptric image formed upon the retina is the useful imagefor visual purposes: the lost light forms four false images of the first 69 PHYSIOLOGICAL OPTICS order, known as the images of Purkinje, one for each surface. Theycorrespond to the rays I, II, III and IV of Fig. 28 (A). The harmfulrays form a series of false images of the second, or less intense, order,of which only one is visible as V and VI in the figure. Ray VII isthe useful ray falling upo
. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . nevertheless,sufficient to be visible. 50. The dioptric image formed upon the retina is the useful imagefor visual purposes: the lost light forms four false images of the first 69 PHYSIOLOGICAL OPTICS order, known as the images of Purkinje, one for each surface. Theycorrespond to the rays I, II, III and IV of Fig. 28 (A). The harmfulrays form a series of false images of the second, or less intense, order,of which only one is visible as V and VI in the figure. Ray VII isthe useful ray falling upon the retina. The positions of the seven images in the eye when the object issituated some 20 degrees below the visual line are shown in Fig. 28 (B). 51. The images of Purkinje. The first of these images, that due tothe anterior surface of the cornea, is produced by a single others are formed by rays which, after having been refracted onceor twice, are then first of all reflected and then suffer other refractionsbefore emerging from the eye. Three of these Purkinje-Sansom images,.
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