ophthalmoscope

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ophthalmoscope

ophthalmoscope , instrument used for examining the inner structure of the eye . The device was invented by the German physiologist H. L. F. von Helmholtz in 1851. His model consisted of three plates of glass pressed together and mounted on a handle at a 45° angle. A light was placed beside the subject whose eyes were to be examined. Some light passed through the plates, but some was reflected back into the eye. The form of the instrument now in general use consists of a concave mirror and a battery-powered light source within a tubular handle. Sighting is through a single or binocular eyepiece. The ophthalmoscope is equipped with a rotating disc of lenses to permit observation of the eye at varying depths and magnifications. Examination of the eye may be enhanced by administering drugs to dilate the pupil.

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ophthalmoscope

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

ophthalmoscope Instrument for examining the interior of the eye, invented by Hermann von Helmholtz in 1851.

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ophthalmoscope

A Dictionary of Nursing | 2008 | Â© A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

ophthalmoscope (off-thal-mŏ-skohp) n. an instrument for examining the interior of the eye.
—ophthalmoscopy (off-thal-mos-kŏ-pi) n.

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"ophthalmoscope." A Dictionary of Nursing. Oxford University Press. 2008. Encyclopedia.com. 22 Dec. 2009 <http://www.encyclopedia.com>.

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