encyclopedia of the eye. diagnosis and treatment
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314 BOOK REVIEWS
direction value of individual retinal perceptive elements, and have a predictable effect on fusion and space perception.
Although aniseikonia is not the subject or purpose of Dr. Ogle's book, it is one of the applications of the researches described. Aniseikonia is defined, and its physiology and geometry described. Many case studies are cited for their theoretic, not clinical, value. The effect of aniseikonia on space perception is fully covered. He does imply that the conflict of impaired space perception with reality makes the eyes undergo ambiguous movements to fix and fuse, which may produce asthenopia.
His discussion of the horopter, Panum's fusional areas, fusional movements from peripheral retinal stimulation, foveal slip, cyclofusional movements, magnification, prismatic distortion, definition of depth clues and stereopsis, visual and stereoscopic acuity, anomalous correspondence, ocular movements, anisometropia, and vision in asymmetric convergence is clear and authentic.
There is no conflict in terminology with ophthalmic usage because Dr. Ogle was directly associated with Walter B. Lancaster at the Dartmouth Eye Institute between November, 1940, and November, 1942, and has been influenced by him indirectly since 1927.
Dr. Ogle's book, Binocular Vision, is an outstanding contribution to binocular physiology and space perception.
Paul W. Miles.
ENCYCLOPEDIA OF THE EYE. Diagnosis and Treatment. By Conrad Berens and
Edward Siegel. New York, J. B. Lippin-cott Company, 1950. 235 pages, 76 illustrations with 42 in color, index. Price: $5.00. This small volume is in no sense the ex
haustive and extensive compilation of facts usually envisioned by the term "encyclopedia" and so well exemplified by the monumental American Encyclopedia and Dictionary of Ophthalmology published in 18 volumes from 1913-21 under the editorial direction of the late Casey Wood. It is in reality little more than an amplified glossary of ophthalmic terms arranged alphabetically with sufficient explanatory material to give a superficial understanding of the terms listed. Definitions and explanations are given with clarity and simplicity readily understandable to anyone with a medical or scientific viewpoint.
It should be an extremely valuable handy desk reference book for the general practitioner, social service worker, office, clinic, or hospital nurse, optometrist, or layman engaged in the insurance, industrial, or legal aspects of ophthalmology who seeks information on the terms used by an ophthalmologist and who can here find meaning and understanding. It is extremely questionable that the work is sufficiently detailed to be of significant value to the ophthalmologist.
The book is modestly illustrated, for the most part with drawings rather than photographs. Many of these are quite diagrammatic but they probably serve to illustrate the points being emphasized in a satisfactory manner. Cross-indexing is well done and adds to the utilitarian value of the volume.
William A. Mann.