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The fact that this book had to go into a second edition so soon after the first one speaks for the popularity of the text. The changes, additions, and deletions are relatively minor.
A programmed text like this is certainly a superb way to learn the basics of optical anomalies and the basic techniques of refraction. This book is highly recommended to anybody who wants to learn refraction.
Blodi FC. Refraction, a Programmed Text. Arch Ophthalmol. 1976;94(10):1817. doi:10.1001/archopht.1976.03910040591041
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