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 ?
(3) The ophthalmoscope works on the principle that light entering the patient's pupil passes through the transparent ocular structures and is reflected from the fundus back to the observer.
If you are examining the patient with your glasses on (distance correction) then start on zero with the ophthalmoscope. If you remove your glasses, start with your refractive error (for example -2.00 is usually a red 2 on the dial).
Direct ophthalmoscope is undoubtedly the most practical instrument available to a physician for ophthalmic examination3.
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.
Anderson's ophthalmoscope even won personal praise from EU Industry Commissioner Gunter Verheugen.
In the study 11 family physicians in New Castle County Del,, attended a 4-hour workshop designed to familiarize them with standardized criteria for diabetic retinopathy and to train them to use a non-mydriatic ophthalmoscope. The device does not require dilation and permits a view of the retina three to five times wider than that of standard ophthalmoscopes.
A team of Welch Allyn researchers in Skaneateles Falls, N.Y., developed the new scope to improve the basic architecture of ophthalmoscopes. Blurry details inside the eye become clear as PanOptic provides a view five times larger than that offered by other scopes.
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.
EasyScan highlighted its retinal scanner that utilises scanning laser ophthalmoscope technology, which provides scans from the front of the retina to retinal pigment epithelium layers.
The Optos scanning laser ophthalmoscope can be used to demonstrate ROP and plus disease, influence treatment decisions and timing, and document resolution postoperatively.
The LIO is a headmounted indirect ophthalmoscope that connects to an IRIDEX laser console and is used to view and perform laser treatments on a patient's eye.