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 ?
Direct fundoscopy, fundus photography, slit-lamp and indirect ophthalmoscopy all play a role as individual modalities, and in combination, in the examination for diabetic eye disease.
When performed, the sensitivity of fundoscopy by primary care staff is quite low and even in the best of circumstances may be lower than the recommended standards for screening (sensitivity >80%, specificity >95% and technical failure <5%).
Read and Cook (5) reviewed the histories, carried out corrected visual acuity tests and performed undilated ophthalmic fundoscopy on 248 diabetic patients attending a day hospital in Cape Town, and found that only 5.
This article discusses those abnormalities that result in hypopigmented lesions evident upon fundoscopy.
Binocular indirect fundoscopy (looking for the presence of papilloedema)
Looking at the allied health professionals, we saw our hospital optometrists were already involved in a glaucoma shared care scheme, they already had the fundoscopy skills and were already used to running their own consultations--taking notes, listening, running to time--and so we thought they were probably the closest we could get (to professionals being able to run the clinic that were not ophthalmologists) by boosting their OCT skills and teaching them how to read OCTs.
Fundoscopy should always form part of the clinical examination, as focal retinal lesions are common in patients with CVC-derived Candida infection, even when blood cultures are negative (Fig.
In some myopes, breaks in Bruch's membrane may be seen on fundoscopy as "lacquer cracks".
There is often an apparent mismatch between the finding of densely clustered crystals, making fundoscopy almost impossible, and minimal patient symptoms.
In order to detect any of the symptoms discussed above, a visual assessment of a child with a suspected tumour must include measurements of VA, cover test and ocular movements, visual fields (where possible), pupil size and responses, and fundoscopy.
The assessment includes intraocular pressure (IOP) measurement, fundoscopy, anterior eye segment examination, pachymetry, corneal topography, and aberrometry.