Download torrent Chapters 11-14, Inclusive
Download torrent Chapters 11-14, Inclusive
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Author: Christian Henry Brown
Page Count: 132 pages
Published Date: 13 Sep 2013
Publisher: Rarebooksclub.com
Publication Country: United States
Language: English
Type: PDF
ISBN: 9781230057958
File size: 13 Mb
File Name: Chapters.11-14,.Inclusive.pdf
Download Link: Chapters 11-14, Inclusive
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ... by Placido, who advised a disk of cardboard or metal about nine inches in diameter, with a central aperture of one-quarter of an inch, to which is attached a. handle of suitable size. On one surface of the disk is painted a series of concentric circles, alternately black and white. Out of compliment to its inventor this keratoscope is known as Placid0's Disk. In the use of this instrument the patient is placed with "his back to the window where a good light is entering room, and the optician facing him with the keratoscope in his hand reflects the light from the window into the eye under examination, when the images of the circles can be seen upon the cornea by looking through the central aperture, which is usually supplied with a convex lens of 4 D. refractive power. If the curvatures of the cornea are normal, the reflected rings will be perfectly circular and of regular shape; but if astigmatism be present, that is, if the curvature of the cornea be greater in one meridian than another, the rings will appear of oval shape, with the longest diameter in the meridian having the longest radius. If the cornea be the seat of irregular astigmatism, the rings will appear very much distorted and out of shape, and portions of them will even be entirely invisible. While we cannot recommend the keratoscope as an instrument of precision in the detection and correction of astigmatism, because it does not definitely locate the impaired meridian, nor does it indicate the degree of defect, yet it forms an interesting method of examination and affords instant information of any departure of the cornea from its normal curves. But astigmatism may also be located in any other of the refractive media, especially the crystalline lens, and this...
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Cartas Escriptas Da India E Da China Nos Annos de 1815 a 1835 Por Jose Ignacio de Andrade a Sua Mulher D. Maria Gertrudes de Andrade, Volume 2... download PDF, EPUB, Kindle
Chapters 11-14, Inclusive by Christian Henry Brown
Author: Christian Henry Brown
Page Count: 132 pages
Published Date: 13 Sep 2013
Publisher: Rarebooksclub.com
Publication Country: United States
Language: English
Type: PDF
ISBN: 9781230057958
File size: 13 Mb
File Name: Chapters.11-14,.Inclusive.pdf
Download Link: Chapters 11-14, Inclusive
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ... by Placido, who advised a disk of cardboard or metal about nine inches in diameter, with a central aperture of one-quarter of an inch, to which is attached a. handle of suitable size. On one surface of the disk is painted a series of concentric circles, alternately black and white. Out of compliment to its inventor this keratoscope is known as Placid0's Disk. In the use of this instrument the patient is placed with "his back to the window where a good light is entering room, and the optician facing him with the keratoscope in his hand reflects the light from the window into the eye under examination, when the images of the circles can be seen upon the cornea by looking through the central aperture, which is usually supplied with a convex lens of 4 D. refractive power. If the curvatures of the cornea are normal, the reflected rings will be perfectly circular and of regular shape; but if astigmatism be present, that is, if the curvature of the cornea be greater in one meridian than another, the rings will appear of oval shape, with the longest diameter in the meridian having the longest radius. If the cornea be the seat of irregular astigmatism, the rings will appear very much distorted and out of shape, and portions of them will even be entirely invisible. While we cannot recommend the keratoscope as an instrument of precision in the detection and correction of astigmatism, because it does not definitely locate the impaired meridian, nor does it indicate the degree of defect, yet it forms an interesting method of examination and affords instant information of any departure of the cornea from its normal curves. But astigmatism may also be located in any other of the refractive media, especially the crystalline lens, and this...
Read online Chapters 11-14, Inclusive Buy and read online Chapters 11-14, Inclusive Download and read Chapters 11-14, Inclusive for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Chapters 11-14, Inclusive ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent
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Cartas Escriptas Da India E Da China Nos Annos de 1815 a 1835 Por Jose Ignacio de Andrade a Sua Mulher D. Maria Gertrudes de Andrade, Volume 2... download PDF, EPUB, Kindle