An apparatus for determining acuity at low illuminations, for testing the light and color sense and for detecting small errors in refraction and in their correction.
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1906 ◽
Vol 16
(3)
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pp. 217-230
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1926 ◽
Vol 3
(10)
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pp. 315-316
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1931 ◽
Vol 14
(4)
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pp. 325-333
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