Ophthalmo-Optical Manual

    Abstract

    WE welcome the appearance of this little volume, because there is a real need for a practical handbook on the main essentials of sight-testing. In this book the subject is treated in a scientific manner seldom adopted in text-books of this nature. The more recent developments of sight-testing are considered; of particular interest are the corrections required to flat trial-case refraction values when toric and similar lenses are to be used. This was first pointed out by the author and is as yet scarcely appreciated by the average optician. The unit planes of such lenses are in quite different positions (relative to the eye) from those of the standard trial case lens, and consequently the refraction values for such lenses have to be materially altered. In addition, a number of very useful tables have been included, and these, together with an exhaustive index, make it a valuable reference book.

    Ophthalmo-Optical Manual.

    William

    Swaine

    By. Pp. v + 152. (London: The Hatton Press, Ltd., n.d.) 5s. net.

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    Ophthalmo-Optical Manual . Nature 115, 12 (1925). https://doi.org/10.1038/115012c0

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