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. 1887 edition. Excerpt: ...hand, the lens is brought very close to the cornea, the horizontal (emmetropic) diameter remains unaltered, while the vertical (myopic) diameter gradually diminishes in size, assuming finally, if sufficiently close, a horizontal oval form. 119. In compound myopic astigmatism, we have, in accordance ...
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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. 1887 edition. Excerpt: ...hand, the lens is brought very close to the cornea, the horizontal (emmetropic) diameter remains unaltered, while the vertical (myopic) diameter gradually diminishes in size, assuming finally, if sufficiently close, a horizontal oval form. 119. In compound myopic astigmatism, we have, in accordance with the facts just stated, a general progressive enlargement of the disk on removal of the lens.with a greater enlargement and drawing out of that diameter of the disk corresponding to the meridian most strongly myopic, while there is a greater shortening of the same diameter when the lens is brought very close to the cornea. 120. We have, of course, an entirely different set of VPPEARANCE OF THE FUNDUS BY THE INDIRECT METHOD. IO7 cnanges in hypermetropic astigmatism. Example: As the lens is withdrawn from the eye, the vertical diameter remains essentially unchanged, while the horizontal diameter, corresponding to the hypermetropic meridian, becomes more and more contracted. Diagnosis: Simple hypermetropic astigmatism, axis vertical. 121. In compound hypermetropic astigmatism there is, on withdrawal of the lens, a narrowing of the disk in all its diame Appearance Of The Fundus Of An Eye With Mixed Astigmatism, When The Auxiliary Lens Is Held Close To The Cornea. ters, but it is more rapid in the diameter corresponding to the most hypermetropic meridian. The result is an oval with its short diameter in the direction of the meridian of least refraction, the same as in the myopic forms, but it is produced in a diametrically opposite manner. In the hypermetropic forms it is the result of contraction in the faulty meridian; in the myopic forms it is due to enlargement in the direction of the faulty meridian. 122. The most...
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