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Dr Michaels has prepared a worthwhile addition to the ophthalmic literature. In a unique format that divides his subject matter into three areas—basics, techniques, and evaluation, he presents a comprehensive look at the subject of refraction from both the practical and didactic points of view. The reader is permitted to pick and choose what interests him, since the discussions of individual topics are not usually interdependent.
Basics includes the nature of light, basic and lens optics, practical ophthalmic and physiological optics, as well as application of optical principles in the correction of ametropia. These are all discussed at a level appropriate to ophthalmologists, not mathematicians or physicists.
I found the section on technique especially well written and practical. It is my guess that Dr Michaels is an astute clinician and perceptive student of human behavior. The sections titled "Refraction, Common Sense, and Psychophysics" and "Introduction to Subjective Refraction"
Garcia GE. Visual Optics and Refraction: A Clinical Approach. Arch Ophthalmol. 1976;94(7):1240. doi:10.1001/archopht.1976.03910040144028