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This book is a comprehensive encyclopedia and dictionary of ocular refraction. It brings together the latest advances in the field and is an invaluable resource for optometrists and ophthalmologists. The book covers various aspects of refraction, including the principles of refraction, the anatomy and physiology of the visual system, and the different types of refractive errors. It also discusses the methods of measuring refractive errors and the various corrective lenses that can be used. The book is written in a clear and concise style, and it is well-illustrated with diagrams and photographs. It is an essential reference for anyone who wants to stay up-to-date on the latest advances in ocular refraction.
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Excerpt from Oculo-Refractive Cyclopedia and Dictionary
Commonest among these accommodative anomalies is a periodic (clonic) or a permanent of the ciliary muscle, which frequently occurs in hyperopia, and which results in a certain amount of locked accommodation that is not easy to demonstrate by any of the methods described above.
Subjectively, such a patient's far point would register inside of its mathematical range, because he is not able to attain complete ciliary relaxation. It may register at infinity, in which case he will appear, so far as his far point is concerned.
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Excerpt from Oculo-Refractive Cyclopedia and Dictionary
Abduction. The turning of the eyes outward beyond the median line by the external rectus muscles. The effect is known as negative convergence. It can be performed by the external recti alone, and whether the obliques ordinarily aid or not is not known. It is regarded as an involuntary function; but under the stimulus of prisms (base in), and the desire for a single image, it can be forced.
Power of abduction is expressed in terms of prism dioptres, the deviation of the visual axis from the median line being considered similarly to the deviation of a ray of light by a prism. It may be measured by finding the strongest prism, base in, with which the eyes can maintain single vision. 'normally, this amounts to 8 or 10 prism dioptres.
The word is also applied to the exercises of the external rectus muscles by means of graded or rotary prisms, base in. The value of such exercises is questionable. (see Convergence.)
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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