The book Optical Truths was written by author Mccormick, Charles, 1858- Here you can read free online of Optical Truths book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Optical Truths a good or bad book?
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again. The — works in the same manner, up to 24. D. Books on the use of the ophthalmoscope are misleading in Digitized by Google S28 OPTICAL TRUTHS. two important directions: First, many of them convey the idea, either directly or indirectly, that the authors measure errors of refraction with it, wbich is an impossibility, because not only the patient but the operator would have to be atropized so thoroughly that neither could work the accom- modation, and were that possible, the skill required... to get the same focus on the vertical and horizontal vessels, the vertical Fig:. 61 Pig. 62 Digitized by Google EYE INSTRUMENTS AND MACHINES. 129 being much larger, would be impossible of attainment; hence such claims are either foolish or deliberate lies. Second, they illustrate diseases and alleged diseases and the student aban- dons the instrument because he finds nothing to correspond with the pictures. The real value of the ophthalmoscope lies in the facility it affords for the study of the quality and quan- tity of the blood in every case.
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