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This is not a textbook on refraction and ocular motility. It is more like a personal conversation with Walter Lancaster—a conversation and not a lecture, because it has the quality of intimacy, as though he were personally instructing the reader. It is characteristic of all Lancaster's teaching that he made his audience think with him and challenge each point made. For this reason alone, the book is a masterpiece of pedagogy.
In the preface Lancaster defines three failures of current texts which it is his objective to correct: 1. They devote too much space to theoretical optics and not enough to image formation on the retina as it actually occurs in life. 2. Current texts fail to teach the student how to measure errors of refraction with the greatest precision. 3. The third deficiency is in the measurement and treatment of the heterophorias.
The first six chapters deal with the
Refraction and Motility. AMA Arch Ophthalmol. 1952;47(6):834–835. doi:10.1001/archopht.1952.01700030853016
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