Vision : its optical defects, and the adaptation of spectacles : embracing first, physical optics, second, physiological optics, third, errors of refraction and defects of accommodation, or optical defects of the eye : with seventy-four illustrations on wood and selections from the test-types of Jaeger and Snellen Fenner, C. S. (Christopher Smith), 1823-1879 author. Refractive Errors Optical Phenomena Second edition, revised, with additions by the author Philadelphia : P. Blakiston, Son & Co., 1883 Text Illustrations 309, 43 pages nlm:nlmuid-67920400R-bk 67920400R http://resource.nlm.nih.gov/67920400R OCLC: 1237243216 English The National Library of Medicine believes this item to be in the public domain : https://creativecommons.org/publicdomain/mark/1.0/