This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...on a large scale in this country and abroad in order to determine the exact relation between school life and study, and the causation of near-sightedness; and the writer's case formed an apt illustration, and was one among many which proved the dire effects of excessive application in causing an elongation of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...on a large scale in this country and abroad in order to determine the exact relation between school life and study, and the causation of near-sightedness; and the writer's case formed an apt illustration, and was one among many which proved the dire effects of excessive application in causing an elongation of eye-ball. CHAPTER XIII. ASTIGMATISM This subject has always been a bugbear and stumbling-block to the average optician. The word conveys to his mind the idea of some complicated defect shrouded in great mystery, difficult or impossible of explanation and comprehension, refusing to be discovered or corrected except by the expert touch of the oculist, and therefore the jeweler-optician concludes it is beyond his reach. While it must be admitted that this defect is more complicated and difficult of study than those which have so far been described, yet the same laws and principles are applicable in both cases, and a close study will rob the subject of much of its mystery and make it plain and easily understood, so that we feel like assuring the student that its difficulties lie rather on the surface and in the imagination. At the same time we would add that the detection and correction of astigmatism will be a severe test of the optometrist's knowledge and understanding of the subject, as well as of his patience and forbearance. But experience is the great teacher and assistant in refraction work, as in many other things, and in connection with a proper knowledge of the defect, soon enables the educated optometrist to accurately adjust the necessary combination of glasses for its correction. HISTORY OF ASTIGMATISM The discovery of this defect dates back a hundred years and more, the credit for which is unanimously given to Thomas Young, but the...
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New in New jacket. {Size: 14.60 x 22.86 cms} Presenting an Exquisite Leather-Bound Edition, expertly crafted by the prestigious organization “Rare Biblio” with Original Natural Leather that gracefully adorns the spine and corners. The allure continues with Golden Leaf Printing that adds a touch of elegance, while Hand Embossing on the rounded spine lends an artistic flair. This masterpiece has been meticulously reprinted in 2020, utilizing the invaluable guidance of the original edition published many years ago in 1921. The contents of this book are presented in classic black and white. Its durability is ensured through a meticulous sewing binding technique, enhancing its longevity. Imprinted on top-tier quality paper. A team of professionals has expertly processed each page, delicately preserving its content without alteration. Due to the vintage nature of these books, every page has been manually restored for legibility. However, in certain instances, occasional blurriness, missing segments, or faint black spots might persist. We sincerely hope for your understanding of the challenges we faced with these books. Recognizing their significance for readers seeking insight into our historical treasure, we've diligently restored and reissued them. Our intention is to offer this valuable resource once again. We eagerly await your feedback, hoping that you'll find it appealing and will generously share your thoughts and recommendations. Lang: -eng, Pages: -416. If it is a multi-volume set, then it is only a single volume. Product Disclaimer: Kindly be informed that, owing to the inherent nature of leather as a natural material, minor discolorations or textural variations may be perceptible. Explore the FOLIO EDITION (12x19 Inches): Available Upon Request.
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