The book Refraction And Visual Acuity was written by author Kenneth Mackenzie Scott Here you can read free online of Refraction And Visual Acuity book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Refraction And Visual Acuity a good or bad book?
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In Table IL, for example, there are red letters on a brown ground, which cannot be deciphered by a red-blind person. The objection to the test is that when the two colours happen to suit the colour-blind person's in- dividual peculiarity, the letters will be recognised. Colour Lanterns Edridge-Green (London). — The description of this is contained in the present text (page 97. ) W. Thomson (Philadelphia). — He has designed a lantern for colour-perception which is used as sup- plementary to the ...New Wool-Test, and to the use of soiled service signal flags. C. H. Williams (Boston, U. S. A). — This lantern presents a large disc of 1 8 inches diameter, w^hich bears thirteen smaller discs of coloured glass. This may be revolved so that any colour can be brought in front of the fixed light. A movable diaphragm in front of the glasses permits of variation in the size of the disc shown. These latter openings cor- i8o REFRACTION AND VISUAL ACUITY respond in size to the component parts of letters in Snellen's test-types ; e.
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