Optometric Courses of Study

Optometric Courses of Study

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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. 1919 edition. Excerpt: ...distance equivalent? If you work at 20 inches, how much must be allowed? What is the form or shape of the reflex as seen in the pupil in emmetropia, hyperopia, myopia and astigmatism respectively? If the reversal point, with a plane mirror, is found in a certain eye to be at 13 inches, what is the amount of the indicated error of refraction? The error _in a certain eye is neutralized by a '3 S. when working at I meter. What Is the error of refraction? The error in a certain eye is neutralized by a-2 D. S. working at 26 inches. What is the indicated error of refraction? Lesson 3. Page 17. Lesson 3. Practical Applications of Skiametry in Emmetropia, Hyperopia and Myopia. The first portion of this chapter is inserted for the benefit of those who are not at all familiar with the practical side of skiametry and who may desire to experiment in the privacy of their own offices or homes. Human eyes rebel and there is a limit to the number of hours that bright lights should be thrown into them. But a schematic eye is possessed of none of these objectionable features; likewise it can be set at any desired position; conditions of emmetropia, hypero ia and myopia may be established and the whole technique oipstatic skiametry mastered. But, in passing, we advise the purchase of the best schematic eye upon the market, with iris diaphragm and properly constructed device for receiving the lenses used in correcting errors. Incidentally we record in passing that Dr. W. B. Ketchum of Los Angeles has in the past very properly objected to the present form of device for holding the neutralizing lenses, suggesting a V-shaped holder so that the lenses may be placed in contact with each other. The suggestions for the use of the schematic eye are arranged as...
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Product details

  • Paperback | 166 pages
  • 189 x 246 x 9mm | 308g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236737296
  • 9781236737298