Geometrische Seh-Proben zur Bestimmung der Sehschärfe bei Functions-prüfungen des Auges

Abstract

THIS little book, with its test objects, is intended as a substitute for Snellen's test types to be used by those who are unable to read, and has been drawn up by Dr. Boettcher, with especial reference to the testing of the vision of recruits. Besides the ordinary types, it contains a number of figures of squares and rectangles, variously disposed in regard to one another at different distances, and it need scarcely be added of various sizes. The very smallest require good vision to enumerate their number and disposition at the ordinary distance of eight inches, whilst the largest should be seen at two hundred feet. They afford a good means of determining the existence of Hypermetropia, Myopia, Astigmatism, and other affections of the retina of the eye, and seem to us to be well adapted for the purpose for which they are intended.

Geometrische Seh-Proben zur Bestimmung der Sehschärfe bei Functions-prüfungen des Auges.

Von Dr. Boettcher. (Berlin, 1870. London: Williams and Norgate).