| darkfield c. |
one with a central stop, permitting production of a hollow cone of light having its apex in the plane of the specimen.
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| darkfield i. |
the throwing of peripheral rays of light upon a microscopical object from the side, the center rays being blocked out: the object appears bright upon a dark background. See under microscope, and see ultramicroscope.
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| darkfield m. |
one with a central stop in the condenser, permitting diversion of the light rays and illumination of the object from the side, so that the details appear light against a dark background. See also ultramicroscope.
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| darkness t. |
involuntary movements of the eyes, resembling nystagmus, which occur in young animals kept in the dark.
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| darkroom t. |
a test to determine the tendency to develop acute angle-closure glaucoma: ocular pressure is measured by the applanation tonometer, the subject is placed in a darkroom for one hour, and applanation tonometry is then repeated.
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