. Refraction and motility of the eye, with chapters on color blindness and the field of vision . mus, 257, 2Qo, 267 Valk twin hook, 253Vertical diplopia, 305 squint, 275, 292Vertigo in paralysis, 299Virtual focus, 23 image, 22, 23Vision, binocular, 206 central, 206 in astigmatism, 171 in hyperopia, 128 in myopia, 150, 153 peripheral, 335Visual acuity, 47 angle, 46 line, 208 minimum angle, 47 purple, 40Vitreous humor, 41opacities in, 69, 70 Wernickes hemianopic pupil-lary, 351 White-black visual substance,326 Williams color lantern, 329 Worsted test for color sense,329 Worth amblyoscope, 284 Ye
. Refraction and motility of the eye, with chapters on color blindness and the field of vision . mus, 257, 2Qo, 267 Valk twin hook, 253Vertical diplopia, 305 squint, 275, 292Vertigo in paralysis, 299Virtual focus, 23 image, 22, 23Vision, binocular, 206 central, 206 in astigmatism, 171 in hyperopia, 128 in myopia, 150, 153 peripheral, 335Visual acuity, 47 angle, 46 line, 208 minimum angle, 47 purple, 40Vitreous humor, 41opacities in, 69, 70 Wernickes hemianopic pupil-lary, 351 White-black visual substance,326 Williams color lantern, 329 Worsted test for color sense,329 Worth amblyoscope, 284 Yellow spot, 76 Young-Helmholz theory of colorsense, 322 Zone of Zinn, 41 0 021 068 972 2 ?p MM I. PHILADELPHIA F. A. DAVIS COMPANY, Publishers English Depot Stanley Phillips, London 1920 COPYRIGHT, 1910COPYRIGHT, 1920 BYF. A. DAVIS COMPANY Copyright, Great Britain. All Rights Reserved. am i3 mo © PRESS OF F. A. DAVIS COMPANY PHILADELPHIA, PREFACE TO SECOND EDITION. This little book has been reprinted a number oftimes without change since its first appearance, but therecent remarkable recrudescence of interest in Ophthal-mology has made another edition desirable, with somechanges and additions. Prepared originally as a series of lectures to thewriters post-graduate students it included a number oftopics not usually found in books on refraction. Everyeffort was made to avoid the theoretical without sacrificingthe essential; to have each subject prepare for and leadup to the following one; to avoid the laying down of dog-matic rules, but to explain reasons so that the studentshould eventually rely on himself and be prepared toundertake the entire functional examinatrefractionmotili00alge
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