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ophthalmoscope |
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ophthalmoscope (ŏfthăl`məskōp'), instrument used for examining the inner structure of the eye eye, 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 ..... Click the link for more information. . 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. ophthalmoscope an instrument for examining the interior of the eye |
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Each rural site will be equipped with video cameras, computers, special electronic stethoscopes, opthalmoscopes (for eye examinations) and other electronic examination devices that will enable the University's medical specialists to "virtually" examine patients. The ophthalmic diagnostic equipment market includes perimeters, automatic and manual refractors, slit lamps, contact and non-contact tonometers, fundus cameras, automatic and manual lens meters, direct and indirect opthalmoscopes, ultrasound equipment, corneal topography systems and imaging systems -- including retinal fluorescein, ICG angiography and optic nerve head imaging systems. |
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