ophthalmoscope

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ophthalmoscope

(ŏfthăl`məskōp'), instrument used for examining the inner structure of the eyeeye,
organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other
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. 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

[äf′thal·mə‚skōp]
(optics)
An instrument, consisting essentially of a concave mirror with a hole in it and fitted with lenses of different powers, for examining the interior of the eye through the pupil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ophthalmoscope

an instrument for examining the interior of the eye
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Input image is SLO(SCaNNING LASER OPTHALMOSCOPE) with present of artefacts like eye lashes, eye lids in image
DONATION: Mick Emanuele (left), his brother Alf (right) and Kyle Jones hand over the money and the opthalmoscope to Jean Whittaker
Keeler Instrument's new HIMag Lens, designed to fit Keeler's "top of the line" Vantage Indirect Opthalmoscope, provides 1.6x higher magnification when used with double aspheric condensing lenses, providing greater disc and vessel examination.
The van's interactive video unit and its state-of-the-art diagnostic peripheral devices, including a 20-power dermascope, an otoscope, an opthalmoscope and an electronic stethoscope can be used to provide direct physician-to-patient consultation.
Your optician will examine the back of your eye with an opthalmoscope, measure the pressure in the eye using a simple "puff" of air, and map out your peripheral vision.
Jean Whittaker uses a diagnostic opthalmoscope on Sunnyside pub landlord Carl Armes, who helped to raise enough money to buy two of the medical instruments.
The money has been used to buy eye equipment, an opthalmoscope, for youngsters on the Caterina children's ward.
This money was used by hospital staff to buy a mobile opthalmoscope auroscope, which is now being used on Amos Barton ward.