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 ?
If you are examining the patient with your glasses on (distance correction) then start on zero with the ophthalmoscope.
Although it can be used as a platform for a variety of applications, the original concept was for an ophthalmoscope to facilitate eye examination in developing countries.
Even when given a baseline image for comparison, professionals frequently have a hard time documenting gradual changes in a cup's dimensions using an ophthalmoscope or retinal photographic techniques.
The researchers did note some challenges of the smartphone method, which included limited view of the peripheral retina, battery life of the ophthalmoscope when consecutively imaging multiple patients, and a learning curve in maneuvering the system.
Leucocoria can be identified with the direct ophthalmoscope and in advanced cases may be visible with the naked eye.
All ri-scope L ophthalmoscope heads are dust-proof, with an easy to operate aperture hand-wheel for apertures and filters.
Jacque Duncan, assistant adjunct professor, Department of Ophthalmology, University of California, San Francisco, will be working on the development of the Adaptive Optics Scanning Laser Ophthalmoscope (AOSLO) for evaluating the retinas of people affected by retinal degenerations.
The Rotary Club of Monkseaton Centenary has donated the ophthalmoscopes under the Rotarians Ophthalmoscope Initiative Partnership, with Sight Savers International.
They will be given the chance to use an optician's ophthalmoscope to look inside the eyeball.
Design examples include the Rochester adaptive optics ophthalmoscope, the Indiana U.
The new Heidelberg scanning laser ophthalmoscope can help to detect glaucoma early and helps opticians to monitor its progression.
Tenders are invited for Procurement of Neonatal and Pediatric Care ICUs under Machinery and Equipment : Ophthalmoscope,Bilirubinometer,Multichannel Electrocardiographic (ECG,Cold Light Sources,Intensive care ventilator (Neonatal & Pediatrics),Ventilator (all patient category) Adult to neonatal etc