direct ophthalmoscope


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ophthalmoscope

 [of-thal´mo-skōp]
an instrument for examining the interior of the eye.
direct ophthalmoscope one that produces an upright, or unreversed, image of approximately 15 times magnification. The direct ophthalmoscope is used to inspect the fundus of the eye, which is the back portion of the interior eyeball. Examination is best carried out in a darkened room. The examiner looks for changes in the color or pigment of the fundus, changes in the caliber and shape of retinal blood vessels, and any abnormalities in the macula lutea, the portion of the retina that receives and analyzes light only from the very center of the visual field. Macular degeneration and opacities of the lens can be seen through direct ophthalmoscopy.
A, Inspection of the eye with a direct ophthalmoscope. B, Structures that are visualized. From Polaski and Tatro, 1996.
indirect ophthalmoscope one that produces an inverted, or reversed, direct image of two to five times magnification. An indirect ophthalmoscope provides a stronger light source, a specially designed objective lens, and opportunity for stereoscopic inspection of the interior of the eyeball. It is invaluable for diagnosis and treatment of retinal tears, holes, and detachments. The pupils must be fully dilated for satisfactory indirect ophthalmoscopy.
scanning laser ophthalmoscope (SLO) an instrument for retinal imaging in which light from a low-power laser beam that scans the retina is reflected back to a sensor; the light detected by the sensor is used to create a full-color composite digital image.

di·rect oph·thal·mo·scope

an instrument designed to visualize the interior of the eye, with the instrument relatively close to the subject's eye and the observer viewing an upright magnified image.

di·rect oph·thal·mo·scope

(dĭr-ekt' of-thal'mŏ-skōp)
An instrument designed to visualize the interior of the eye, with the instrument relatively close to the subject's eye and the observer viewing an upright magnified image.

ophthalmoscope

an instrument for examining the interior of the eye. It sends a bright, narrow beam of light through the lens of the eye, and contains a perforated mirror and lenses through which the veterinarian can examine interior parts of the eye. It is helpful in detecting possible disorders of the eyes, as well as disorders of other organs that are reflected in the condition of the eyes.

direct ophthalmoscope
one that produces an upright, or unreversed, image of approximately 15 times magnification.
indirect ophthalmoscope
one that produces an inverted, or reversed, direct image of two to five times magnification.
References in periodicals archive ?
Thanks to their cooperative nature, we were able to get some excellent views of their retinas with a direct ophthalmoscope, something a lot of medical student struggle with in human patients.
Follow-up of 'stable' glaucoma in the community was performed by optometrists, the majority of whom (72%) were using a direct ophthalmoscope to monitor for progression--ophthalmologists stopped using direct ophthalmoscopes to examine the optic discs in favour of indirect biomicroscopy at least 20 years ago.
Tenders are invited for Processing of Vitreotomy cutter for existing Phaco-system, Indirect and Direct Ophthalmoscope, Eye Bank Keroto-analyser, Radiofrequency Cautery, Fransworth Munsell Hunderd -Hue Color Vision Tester, Bagolini Striated Glasses, Hoskin Suturolysis, Smart Vision System, Flippers, etc for department of Ophthalmology

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