Essentials of Refraction
Essentials of Refraction
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In our eReader you can find the full English version of the book. Read Essentials of Refraction Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Essentials of Refraction
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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through a couatx lens, is a virtual not a real image), must be kept steadily in view and the objective lens slowly withdrawn in a perfectly straight line, away from the patient's eye toward tlie observer's.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.
What to read after Essentials of Refraction?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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through a couatx lens, is a virtual not a real image), must be kept steadily in view and the objective lens slowly withdrawn in a perfectly straight line, away from the patient's eye toward tlie observer's.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.
What to read after Essentials of Refraction?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
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