direct ophthalmoscope one the produces an upright, or unreversed, image of approximately 15 times magnification. The straight ophthalmoscope is used to check the fundus that the eye, i beg your pardon is the back portion of the interior eyeball. Check is finest carried out in a darkened room. The examiner watch for changes in the shade or colors of the fundus, transforms in the caliber and shape of retinal blood vessels, and any abnormalities in the macula lutea, the part of the retina that receives and analyzes light just from the very center the the visual field. Macular degeneration and opacities the the lens can be watched through direct ophthalmoscopy.

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A, investigate of the eye v a direct ophthalmoscope. B, structures that space visualized. From Polaski and Tatro, 1996.
indirect ophthalmoscope one that produces one inverted, or reversed, straight image of two to 5 times magnification. One indirect ophthalmoscope gives a stronger light source, a specially designed target lens, and opportunity because that stereoscopic investigate of the internal of the eyeball. The is invaluable for diagnosis and also treatment the retinal tears, holes, and detachments. The pupils must be fully dilated for satisfactory indirect ophthalmoscopy.
scanning laser ophthalmoscope (SLO) one instrument because that retinal imaging in which light from a low-power laser beam the scans the retina is reflected back to a sensor; the light detected by the sensor is provided to develop a full-color composite digital image.
An tool for examining the inner structures that the eye, especially the retina, consisting essentially of a mirror that shows light right into the eye and also a main hole through which the eye is examined.
oph·thal′mo·scop′ic (-skŏp′ĭk), oph·thal′mo·scop′i·cal (-ĭ-kəl) adj.
oph′thal·mos′co·py (ŏf′thăl-mŏs′kə-pē, ŏp′-) n.

ophthalmoscope

one instrument capable simultaneously of illuminating and enabling observation that the inside of the eye. The direct ophthalmoscope is held as close as feasible to the eye; the indirect ophthalmoscope is provided at a quick distance and also requires the use of a different hand-held image-forming lens.
An instrument offered for the town hall the inside of the eye that consists of a concave mirror v a feet in the center through which the physician examines the eye, and a light resource that is reflected right into the eye by the mirror.
Mentioned in: Eye Examination, Glaucoma, Papilledema, physical Examination, Retinal Artery Occlusion, Retinitis Pigmentosa, X rays of the Orbit
An instrument because that viewing the media and fundus that the eye. It consists essentially of: (1) a light source (a halogen or tungsten bulb), a condenser system, a lens and also a reflector (a prism, mirror, or metallic plate) to illuminate the internal of the eye, and (2) a viewing system consisting of a vision hole and also focusing device (usually a rack of lenses of different powers) to compensate because that the combined errors that refraction the the patient and also practitioner. Seetransillumination; Visuscope.binocular indirect ophthalmoscope(BIO) an indirect ophthalmoscope through a binocular viewing mechanism for obtaining a magnified, inverted, stereoscopic image of the fundus. It consists of a light source placed above and also between the examiner"s eyes on a headset. This illuminates a handheld condensing lens that high optimistic power close to the patient"s eyes, i m sorry forms photo of the patient"s pupil in both the the examiner"s pupils. An aerial image of the patient"s fundus is formed in between the condensing lens and also the examiner (if the patience is emmetropic the image will be developed in the focal plane of the condensing lens). It appears inverted and stereoscopically with the oculars attached to the headset. Stereopsis is derived by to reduce the interpupillary street by way of winter or prisms within the headset the the instrument. This ophthalmoscope allows examination the a broad area that fundus and also perception the depressed and raised areas (Fig. O1).confocal scanning laser ophthalmoscope(CSLO) one instrument using a confocal laser system to carry out and analyse a three-dimensional picture of the optic nerve head, peripapillary retina and macular region. The instrument uses a 670 nm diode laser and also measures the quantity of light reflected from a series of 16-64 optical part in depth and also reconstructs lock to show the topography that the optic nerve head and also a measure of the thickness the the retinal nerve fibre layer (RNFL). The RNFL thickness is contrasted with an age-matched normative database. The instrument is used to analyse RNFL defects, to detect damage to the optic nerve head and progressive changes over time in glaucomatous eyes, and retinal oedema, which wake up in the at an early stage stages the diabetic retinopathy. Syn. Confocal scanning laser tomograph. Seeglaucoma detection; confocal microscope.direct ophthalmoscopeAn ophthalmoscope that gives a virtual, erect image with a magnification of around ✕15 the the fundus, created by the patient"s eye in combination with everything focusing lenses are essential to correct because that the refractive errors of the observer and patient. The tool is held at close variety to the patient"s eye and the field of see is small (less 보다 10º) (Fig. O2). The magnification M of a straight ophthalmoscope is same to
/4where Fe is the strength of the eye. Example: the magnification of the fundus of an aphakic eye the +40.00 D is same to 40/4 = 10✕.indirect ophthalmoscopeAn ophthalmoscope that offers an aerial picture of the fundus (and no the fundus itself similar to a direct ophthalmoscope), which is real, inverted, through a magnification the ✕5 come ✕7 and formed at approximately arm"s length from the practitioner. This aerial photo is usually developed by a solid positive lens varying in power from +13 D to +30 D that is hosted in former of the patient"s eye. The practitioner see this aerial picture through a sight hole with a concentrating lens to compensate because that ametropia and accommodation. This instrument gives a huge field of watch (25-40º) and allows easier examination of the periphery of the retina. This instrument has been supplanted by the binocular indirect ophthalmoscope. The magnification of one indirect ophthalmoscope M is same to
/ Fcwhere Fe and Fc are the powers of the eye and also of the condensing lens, respectively. Example: making use of a condensing lens that +15.00 D to view the fundus of one emmetropic eye returns a magnification the 60/15 = 4✕. Seefundus camera; reverse image.scanning laser ophthalmoscope(SLO) one ophthalmoscope that provides a constant image that the ocular fundus on a TV monitor. It consists of a narrow laser beam, i beg your pardon is scanned horizontally and vertically to develop a rectangle-shaped area (called a raster) on the retina. A tiny beam of irradiate is reflected ago out the the eye come a light detector, i m sorry monitors the brightness that each suggest on the raster and relays the details to the corresponding facet on a TV monitor whereby the image have the right to be regarded and/or stored. Low illumination is used to make this procedure more comfortable than conventional photography and also mydriatics space usually unnecessary. The ar of view extends approximately 40 degrees. The instrument has actually been especially an important in diagnosing glaucoma and also in research.

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Fig. O1 Binocular indirect ophthalmoscope. The light source mounted above and also between the examiner"s eyes illuminates the condenser, which pictures the source at the perimeter of the patient"s pupil. The illumination does no overlap the monitoring beam. The condenser lens is handheld; it creates an turning back aerial image of the retina
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Fig. O2 Optical rule of the simplest kind of straight ophthalmoscope (O, observer"s eye; P, patient"s eye; M, semi-silvered mirror)
Table O1 Comparison between direct and indirect ophthalmoscopes
ophthalmoscopeformimagefield of view (in degrees)magnification
directmonocularerect8✕15
indirectmonocularinverted20-40°✕5 come ✕7
indirectbinocularinverted40-75✕1.5 come ✕4.5*
*Varies according to the strength of the condensing lens.