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To the Editor:
—The reviewer of "Principles of Ophthalmology" (Arch. Ophth. 44:758 [Nov.] 1950) considers the title misleading, as in his opinion "it is really a series of essays setting forth the author's own, and extremely original, ideas."May I be allowed to point out that, on the contrary, there exists throughout only one idea, and one idea only, which incidentally is not even original, though it does produce original results when applied to ophthalmology. The idea is that of coordination, which, although of prime importance in all investigations, is not considered necessary in ophthalmology. It is, however, only by piecing together the varied and numerous facets produced by coordination that a comprehensive picture can be obtained of what constitutes the principles of ophthalmology.Anatomic details, such as are cited in the review, are of themselves of little significance until they are brought into relationship with each other and