Ocular Accommodation
Ocular Accommodation
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In our eReader you can find the full English version of the book. Read Ocular Accommodation 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 Ocular Accommodation
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The accommodation, if strong and active, should respond readily to the demands made upon it up to within possibly three-quarters of its total capacity. To return, then, to our illustrative case, we turn up —2, —3, —3. 5, — 4 diopters and so on, giving the ciliary time to respond in each case, until finally, let us say, with a —5 D. S. Reading is difficult and with a —6 D. S. The reading of much larger type is impossible. We therefore conclude that the total accommodation available at the thirte...en inch reading point as evidenced by this modus operandi is, as a maximum, 9 diopters. This 9 diopters is the sum of the 3 diopters exerted by the accommodative mechan- ism in order to read at thirteen inches and the 6 diopters of additional accommodation as elicited by the concave lenses inserted.
If, again, with —2D. S. , V = 20/20, these tests upon the accommodative resources are instituted, the patient wearing the distance correction, and it is found that a —3 D. S. Meas- ures the maximum reserve at thirteen inches, it may then be concluded that, under the conditions through and by which the tests are made, some 6 diopters of accommodation are available and can be effectually put into operation at the reading point.
What to read after Ocular Accommodation?
You can find similar books in the "Read Also" column, or choose other free books by Charles Sheard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The accommodation, if strong and active, should respond readily to the demands made upon it up to within possibly three-quarters of its total capacity. To return, then, to our illustrative case, we turn up —2, —3, —3. 5, — 4 diopters and so on, giving the ciliary time to respond in each case, until finally, let us say, with a —5 D. S. Reading is difficult and with a —6 D. S. The reading of much larger type is impossible. We therefore conclude that the total accommodation available at the thirte...en inch reading point as evidenced by this modus operandi is, as a maximum, 9 diopters. This 9 diopters is the sum of the 3 diopters exerted by the accommodative mechan- ism in order to read at thirteen inches and the 6 diopters of additional accommodation as elicited by the concave lenses inserted.
If, again, with —2D. S. , V = 20/20, these tests upon the accommodative resources are instituted, the patient wearing the distance correction, and it is found that a —3 D. S. Meas- ures the maximum reserve at thirteen inches, it may then be concluded that, under the conditions through and by which the tests are made, some 6 diopters of accommodation are available and can be effectually put into operation at the reading point.
What to read after Ocular Accommodation?
You can find similar books in the "Read Also" column, or choose other free books by Charles Sheard to read onlineMoreLess
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