Essentials of Refraction

Cover Essentials of Refraction
Essentials of Refraction
Thomas George Atkinson
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This image of the disc (which, being viewed through a couatx lens, is a virtual not a real image), must be kept steadily in view and the objective lens slowly withdrawn in a perfectly straight line, away from the patient's eye toward tlie observer's.
Use of the Ophthalmoscope (Indirect Method). In Emmetropia. — If upon withdrawal of the objective the image of the disc remains the same size, the eye is normal.
OPHTHALMOSCOPY 111 In Hypermetropia. — If the image diminish in size^ tlie eye is hxpe
...rmotropic. The greater the diminution the higher the degree of hyperme- tropia. Convex lenses shoukl tlien he wheeled be- fore the siglit liole nntil the strongest one is found wliicli will cause the image to remain sta- tionary in size on withdrawing the objective. This is the measure of the liypcrmetropia.
In Myopia. — If the image increases in size, the eye is myopic; the greater the increase the higher tlie degree of myopia. Concave lenses must then be wdieeled before tlie sight liole until the weak- est is found wliicli will neutralize the change in the size of the image.


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