ophthalmoscope /oph·thal·mo·scope/ (of-thal´mo-skōp) an instrument containing a perforated mirror and lenses used to examine the interior of the eye.
indirect ophthalmoscope,
ophthalmoscope [of-thal´mo-skōp]
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.
scanning laser ophthalmoscope an instrument for retinal imaging in which the retina is scanned by a low-power laser and the reflected light is used to create a digital image.
| indirect ophthalmoscope n. An instrument designed to visualize the interior of the eye, with the instrument at arm's length from the subject's eye and the observer viewing an inverted image through a convex lens located between the instrument and the subject's eye. |
indirect ophthalmoscope,
an ophthalmoscope with a biconvex lens that produces a reversed inverted and magnified stereoscopic image.
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.
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.
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