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This well-printed volume is a simple practical treatise on the diagnosis and treatment of refractive errors. Beginning with short chapters on optics, lenses, the human eye as an optical instrument, glasses and accommodation, the author goes on to deal with cycloplegia, the measurement of visual acuity, and objective and subjective methods of measuring refraction, closing with a discussion of refractive errors, presbyopia, aphakia, and magnifying lenses. There is an adequate index.