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This volume is an amplification of the author's "Manual of Practical Orthoptics," published in 1938. The inclusion of a chapter on the "Orthoptic Treatment of Service Candidates," with special emphasis on the ocular requirements for aviation candidates, provides a timely addition.
Mr. Giles, a member of the staff of the London Refraction Hospital, is an optical practitioner (optometrist in America), and references throughout the text indicate that he has written it primarily for use by optical practitioners. His point of view may be illustrated by the following quotation : "The method developed by Worth is still the basis of most of the work of present day medical orthoptists, but advanced workers, particularly those outside the medical profession, do not now completely accept his teaching."
Mr. Giles is an ardent disciple of Cantonnet. The Remy separator and the Pigeon-Cantonnet stereoscope are his basic training instruments. Such a fundamental instrument as a major