The Shadow Test in Ocular Diagnosis Without Prejudice As to Method Mirror Di
The Shadow Test in Ocular Diagnosis Without Prejudice As to Method Mirror Di
George a Rogers
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Is substituted, and this reverses motion making it with the mirror. Since the 2. 50 sph. Is a 1. 00 D. Over- correction of the hyperopia, it focuses the observed eye at 40 in. , and this is forward of the position of the observ- ing eye. It is the aerial image of the reflex that now comes into view, and its motion is the opposite of that of the true reflex. Reducing our lens to a +2. 25 sph. We obtain the nearest to neutralization it is possible to get. All of the phenomena of neutrality are at...jbheir best — enlarged, pale reflex and very quick motion. Since a +2. 25 sph. Has neutralized the observed eye, with the lens imposed light from the retina of the observed eye emerges and focuses at 53 in. , the testing distance, or at the observing eye. It has therefore been made, by the lens, 0. 75 D. Myopic. To correct the ^pind^g-"^ eye, or make it normal for distance, would require 0. 75 D. Less plus, or +1. 50 D. It is seen that with the concave mirror at 53 in. The only differences to be observed from the plane mirror test at 40 in.
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