. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, tthe fault is behind and not in front of the mirror. The book is wellprinted and usefully illustrated. o REFRACTION AND HOW TO REFRACT INCLUDING SECTIONS ON OPTICS, RETINOSCOPY, THEFITTING OF SPECTACLES AND EYE-GLASSES, ETC. BY n JAMES THORINGTON, , , ADJUNCT PROFESSOR OF OPHTHALMOLOGY IN THE PHILADELPHIA POLYCLINIC AND COLLEGE FOR GRADUATES IN MEDICINE ; ASSISTANT SURGEON AT WILLS* EYE HOSPITAL ; ASSOCIATE MEMBER OF THE AMERICAN OPHTHALMOLOGICAL SOCIETY ; FELLO
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, tthe fault is behind and not in front of the mirror. The book is wellprinted and usefully illustrated. o REFRACTION AND HOW TO REFRACT INCLUDING SECTIONS ON OPTICS, RETINOSCOPY, THEFITTING OF SPECTACLES AND EYE-GLASSES, ETC. BY n JAMES THORINGTON, , , ADJUNCT PROFESSOR OF OPHTHALMOLOGY IN THE PHILADELPHIA POLYCLINIC AND COLLEGE FOR GRADUATES IN MEDICINE ; ASSISTANT SURGEON AT WILLS* EYE HOSPITAL ; ASSOCIATE MEMBER OF THE AMERICAN OPHTHALMOLOGICAL SOCIETY ; FELLOW OF THE COLLEGE OF PHYSICIANS OP PHILADELPHIA; MEMBER OF THE AMERICAN MEDICAL ASSOCIATION ; OPHTHALMOLOGIST TO THE ELWYN AND THE VINE- ^ ^k LAND TRAINING SCHOOLS FOR FEEBLE-MINDED CHILDREN ; RESIDENT .nS PHYSICIAN AND SURGEON PANAMA RAILROAD CO. AT COLON(aSPINWALL), ISTHMUS OF PANAMA, 1882-1889, ETC. TWO HUNDRED ILLUSTRATIONS THIRTEEN OF WHICH ARE COLORED ONTAt-iiO COLLEGE OF PHARMACY 44 GERRARD ST. E. TORONTO,PHILADELPHL\P. BLAKISTONS SON & CO. IOI2 WALNUT STREET1900 Copyright, 1S99, by P. Blakistons Son & WM. F. FELL & CO., Electrotvpers and Printers,1220-24 sansom street, philadelphia. PREFACE. This book has been written at the request of the manystudents who have attended the authors lectures on Refraction at the Philadelphia Polyclinic; and while itis intended for all beginners in the study of Ophthalmology,yet it is especially for those practitioners and students whomay have a limited knowledge of mathematics and who cannot readily appreciate the classic treatise of Bonders. In the preparation of the manuscript and in arranging thesepages the writer has planned to be systematic and practi-cal, so that the student, starting with the consideration ofrays of light, is gradually brought to a full understandingof optics ; and following this, he is taught the standard eye,and then is given a description of ametropic eyes, with adifferential diagnosis of each, until finall
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