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 ?
The canine ocular fundus is a challenge for the examiner because of its enormous variations in normal ophthalmoscopic appearance (Crispin, 2005).
Ophthalmoscopic signs include central retinal artery pulsation or occlusion, elevated intraocular pressure, op tic disc swelling, retinal edema, and venous congestion.
Patients diagnosed with mild NPDR or more severe states received the treatment recommended by AAO's Preferred Practice Patterns (American Academy of Ophthalmology Retina Panel 2008): one to four annual ophthalmoscopic evaluations, fluorescein angiography with focal/grid laser photocoagulation treatment for CSME, and scatter (panretinal) laser photocoagulation therapy for Non-HR or HR-PDR and no CSME.
Like the DCCT (2), we distinguished between a primary cohort of patients with a 1- to 5-year history of diabetes, no ophthalmoscopic retinopathy, and AER <40 mg/24 h at "entry" (i.
Practical approach to ophthalmoscopic retinal diagnosis.
They are multiple and bilateral, and the most common ophthalmoscopic finding in falciparum malaria (1,2).
Ocular involvement includes painless, unilateral vision loss with ophthalmoscopic examination revealing edematous optic discs and exudates surrounding the macula;
Other screening regimens that are proposed are clinical, laboratory, and ophthalmoscopic tests.
Carr and Heckenlively (4) describe several characteristic ophthalmoscopic findings in patients with retinitis pigmentosa including: narrowing of the retinal arterioles; and pigment changes such as bony spicules, clumps or spots of pigment.
Several studies have shown that standard fundus photography through a dilated pupil is more sensitive than a direct ophthalmoscopic exam in screening for DR [14,24-28].
Ophthalmoscopic examination revealed a red reflex bilaterally with no evidence of arteriovenous nicking or hemorrhages noted.