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.

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.

ophthalmoscope

an instrument for examining the interior of the eye
References in periodicals archive ?
Ophthalmoscopic abnormalities in adults with falciparum malaria.
In all 20 eyes examined, the level of mydriasis achieved allowed a complete ophthalmoscopic examination.
There was no immediate necrosis and minimal to no ophthalmoscopic evidence of retinal damage reported.
It has several different ophthalmoscopic presentations, which have previously been described as separate conditions.
The size, location, and density of scotomas cannot be inferred consistently from the ophthalmoscopic appearance of the macula.
Patients suspected to have congenital toxoplasmosis and cytomegalovirus were given a skull ultrasound, tomography, or x-ray and ophthalmoscopic and audiologic exams.
Only a comprehensive ophthalmologic examination that includes careful examination of the internal structures of the eye and dilated ophthalmoscopic examination of the optic nerve is likely to detect glaucoma in a majority of persons.
The number of persons diagnosed with Diabetes, continuously enrolled who had a retinal ophthalmoscopic examination (Special eye exam) performed during the previous year.
Test results should included a measure of the current visual acuity and previous visual acuity (if known), indications as to the presence or absence of RAPD, and a summary of the ophthalmoscopic findings.