Skiascopy and its practical application to the study of refraction / by Edward Jackson, A.M.,M. D.

  • Edward Jackson
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: Skiascopy and its practical application to the study of refraction / by Edward Jackson, A.M.,M. D. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    CONTENTS PREFACE 5 CHAPTER I. History 7 Name t . 10 Difficulties . . II How to Study the Test 12 CHAPTER II.—General Optical Principles. The reversal of movement 18 The Point of Reversal 20 Real Movement of light on retina, Plane Mirror ... 21 Real Movement of light on retina, Concave Mirror . . 23 Apparent Movement of light in pupil 25 Rapidity of Movement of light on the retina .... 27 Magnification of the retina 29 Form of the light area 30 Brightness of light in the pupil 32 Finding the point of reversal 33 CHAPTER III.—Conditions of Accuracy. The Source of light 35 Focusing of light on the retina 37 Position of observer for greatest accuracy 39 Irregularities of the Media and Surfaces . . .40 Distance of Surgeon from Patient ... , . . .42 Final test 44 CHAPTER IV.—Regular Astigmatism. Two points of reversal 45 The Band-like appearance 46 Changes in the Light area at different distances . . .51 Direction of movement of the band 53 CHAPTER V.—Aberration and Irregular Astigmatism. Appearance of Irregular Astigmatism 55 Symmetrical Aberration 57 The Visual Zone 58 Appearances of Positive Aberration eg
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