. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . .^ertt Myopia £j = 2,5 mma. (B).—Illustrative of the Conjugacy of Foci and Nature of the Emergent Beamsin Plane Mirror Eetinoscopy when Myopia iYPEROPIA (C).—Illustrative of the Conjugacy of Foci and Nature of the Emergent Beamsin Plane Mirror Eetinoscopy when Hyperopia Obtains. Fig. 101.—Illustrative of the Conjugacy of Foci and Nature of Emergent Beams iu Plane Mirror Eetinoscopy when (A) Emmetropia, (B) Myopia and (C) Hyperopia Obtains. gives f2 = — 135 mms. = — cms. This
. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . .^ertt Myopia £j = 2,5 mma. (B).—Illustrative of the Conjugacy of Foci and Nature of the Emergent Beamsin Plane Mirror Eetinoscopy when Myopia iYPEROPIA (C).—Illustrative of the Conjugacy of Foci and Nature of the Emergent Beamsin Plane Mirror Eetinoscopy when Hyperopia Obtains. Fig. 101.—Illustrative of the Conjugacy of Foci and Nature of Emergent Beams iu Plane Mirror Eetinoscopy when (A) Emmetropia, (B) Myopia and (C) Hyperopia Obtains. gives f2 = — 135 mms. = — cms. This distance f2 is then to bemeasured from the cornea toward the retina, which shows that thepoint conjugate to the retina does not exist in space but lies behindthe retina. That is to say, we have a virtual object which means that 199 PHYSIOLOGICAL OPTICS the rays emerging from the eye under these conditions will be divergentbut that, by projection backwards, they can be made to meet at apoint back of the retina. These various conditions, using an illuminatedretinal area as an object, are diagrammed in Figs. 101 (A), 101 (B)and 101 (C), representing respectively emmetropia, myopia and hyper-opia. The center of curvature is represented as at C a
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