scotoma


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Related to scotoma: centrocecal scotoma, arcuate scotoma, positive scotoma, negative scotoma

scotoma

 [sko-to´mah] (Gr.)
1. an area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision.
2. mental scotoma. adj., adj scotom´atous.
absolute scotoma an area within the visual field in which perception of light is entirely lost.
annular scotoma a circular area of depressed vision surrounding the point of fixation.
arcuate scotoma an arc-shaped defect of vision arising in an area near the blind spot and extending toward it.
central scotoma an area of depressed vision corresponding with the fixation point and interfering with or abolishing central vision.
centrocecal scotoma a horizontal oval defect in the visual field situated between and embracing both the fixation point and the blind spot.
color scotoma an isolated area of depressed or defective vision for color in the visual field.
hemianopic scotoma depressed or lost vision affecting half of the central visual field; see also hemianopia.
mental scotoma in psychiatry, a figurative blind spot in a person's psychological awareness, the patient being unable to gain insight into and to understand his mental problems; lack of insight.
negative scotoma a scotoma appearing as a blank spot in the visual field; the patient is unaware of it, and it is detected only by examination.
peripheral scotoma an area of depressed vision toward the periphery of the visual field.
physiologic scotoma that area of the visual field corresponding with the optic disk, in which the photosensitive receptors are absent.
positive scotoma one which appears as a dark spot in the visual field.
relative scotoma an area of the visual field in which perception of light is only diminished, or loss is restricted to light of certain wavelengths.
ring scotoma annular s.
scintillating scotoma blurring of vision with the sensation of a luminous appearance before the eyes, with a zigzag, wall-like outline; called also teichopsia.

sco·to·ma

, pl.

sco·to·ma·ta

(skō-tō'mă, skō-tō'mă-tă), Do not confuse this word with scatoma.
1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed.
2. A blind spot in psychological awareness.
[G. skotōma, vertigo, fr. skotos, darkness]

scotoma

/sco·to·ma/ (sko-to´mah) pl. scoto´mata  
1. an area of depressed vision in the visual field, surrounded by an area of less depressed or of normal vision.
2. mental s.scotom´atous

annular scotoma  circular area of depressed vision surrounding the point of fixation.
central scotoma  an area of depressed vision corresponding with the point of fixation and interfering with central vision.
centrocecal scotoma  a horizontal oval defect in the field of vision situated between and embracing both the point of fixation and the blind spot.
color scotoma  an isolated area of depressed or defective vision for color.
hemianopic scotoma  depressed or lost vision affecting half of the central visual field.
mental scotoma  a figurative blind spot in a person's psychological awareness, the person being unable to gain insight into and to understand their mental problems; lack of insight.
negative scotoma  one which appears as a blank spot or hiatus in the visual field, the patient being unaware of it.
peripheral scotoma  an area of depressed vision toward the periphery of the visual field, distant from the point of fixation.
physiologic scotoma  that area of the visual field corresponding with the optic disk, in which the photosensitive receptors are absent.
positive scotoma  one which appears as a dark spot in the visual field, the patient being aware of it.
relative scotoma  an area of the visual field in which perception of light is only diminished, or loss is restricted to light of certain wavelengths.
ring scotoma  annular s.
scintillating scotoma  teichopsia.

scotoma

(skə-tō′mə)
n. pl. scoto·mas or scoto·mata (-mə-tə)
An area of diminished vision within the visual field.

sco·to′ma·tous adj.

scotoma

[skōtō′mə] pl. scotomas, scotomata
Etymology: Gk, skotos, darkness, oma, tumor
a defect of vision in a defined area of the visual field in one or both eyes. A common prodromal symptom is a shimmering film appearing as an island in the visual field.

scotoma

Neurology A vision defect Psychiatry A figurative blind spot in a person's awareness

sco·to·ma

, pl. scotomata (skō-tō'mă, -mă-tă)
1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed.
2. A blind spot in psychological awareness.
[G. skotōma, vertigo, fr. skotos, darkness]

scotoma

A blind spot or area in the field of vision. This may be caused by GLAUCOMA, MULTIPLE SCLEROSIS, MIGRAINE, retinal disorders or a brain tumour.

Scotoma

An area of lost or depressed vision within the visual field surrounded by an area of normal vision. Survivors of retinoblastoma frequently develop scotomas.
Mentioned in: Retinoblastoma

scotoma 

An area of partial or complete blindness surrounded by normal or relatively normal visual field. See angioscotoma; hemianopia; quad-rantanopia.
absolute scotoma A scotoma in which vision is entirely absent in the affected area. See retinoschisis; relative scotoma.
annular scotoma See arcuate scotoma; ring scotoma.
arcuate scotoma Scotoma running from the blind spot into the nasal visual field and following the course of the retinal nerve fibres. A double arcuate scotoma extending both in the upper and lower part of the field may join to make an annular scotoma or ring scotoma. A common cause is glaucoma. Syn. comet scotoma; scimitar scotoma. See arcuate fibres; retinal raphe; Bjerrum's scotoma.
Bjerrum's scotoma An arcuate scotoma extending around the fixation point (usually located between the 10º and 20º circles), which occurs in open-angle glaucoma. It often extends from the horizontal midline to the optic disc (Fig. S4). Syn. Bjerrum's sign. See Roenne nasal step; Seidel's scotoma.
central scotoma A scotoma involving the fixation area.
comet scotoma See arcuate scotoma.
congruous s'. Scotomas in the two visual fields that are identical. They form a single defect in the binocular visual field. Such scotomas are often the result of lesions in the visual cortex.
flittering scotoma See scintillating scotoma.
incongruous s'. Scotomas in the two visual fields that differ in one or more ways. Such scotomas are often the result of lesions in the optic tract.
junction scotoma A visual defect due to a lesion (e.g. a pituitary tumour) at the junction of one optic nerve with the chiasma where it is believed that the inferior nasal fibres of the contralateral optic nerve loop before passing backward to the optic tract. The visual defects typically consist of an upper temporal quadrantanopia in the field of the contralateral eye with, usually, a temporal hemicentral scotoma in the ipsilateral eye. Some authors attribute these visual defects to prechiasmal compression of one optic nerve plus compression of the whole chiasma. See Wilbrand's knee.
negative scotoma A scotoma of which the person is unaware. The physiological blind spot is an example of a negative scotoma but it is usually referred to as a physiological scotoma.
paracentral scotoma 
A scotoma involving the area adjacent to the fixation area.
physiological scotoma See negative scotoma.
positive scotoma A scotoma of which the person is aware.
relative scotoma A scotoma in which there is some vision left or in which there is blindness to some stimuli, but not to others. See absolute scotoma.
ring scotoma 1. An annular scotoma surrounding the fixation point. It may be formed by the development of two arcuate scotomas. Syn. annular scotoma. 2. A circular area in the peripheral field of view at the edge of a strong convex spectacle lens which is not seen (Fig. S5). This scotoma is due to the prismatic effect at the edge of the lens and unlike other scotomas, not from a pathological condition. When the head turns the ring scotoma also turns and it is then called a roving ring scotoma. See jack-in-the-box phenomenon.
roving ring scotoma See jack-in-the-box phenomenon; ring scotoma.
scimitar scotoma See arcuate scotoma.
scintillating scotoma The sudden appearance of a transient, shimmering scotoma with a zigzag outline of brightly coloured lights (also called a fortification spectrum or fortification figures). It usually occurs as one of the first symptoms of a migraine attack. Syn. flittering scotoma. See migraine; teichopsia.
Seidel's scotoma An arcuate scotoma extending above and below the blind spot found in glaucoma. Syn. Seidel's sign. See Bjerrum's scotoma.
Fig. S4 Bjerrums scotomaenlarge picture
Fig. S4 Bjerrum's scotoma
Fig. S5 Ring scotoma produced by a strong convex spectacle lens (shaded area)enlarge picture
Fig. S5 Ring scotoma produced by a strong convex spectacle lens (shaded area)

sco·to·ma

, pl. scotomata (skō-tō'mă, -mă-tă)
Isolated area of varying size and shape, within visual field, in which vision is absent or depressed.
[G. skotōma, vertigo, fr. skotos, darkness]
References in periodicals archive ?
Participants had central scotomas in both, one, or neither eye with the frequency of 35, 39, and 26 percent, respectively.
In low vision rehabilitation, these participants would be most likely either to read into their scotoma or shift the scotoma superiorly while reading.
the scotoma to the right of their preferred location, 15% to the left, and 22% above the preferred fixation area.
Microperimetry allows clinicians to precisely delineate the borders of the scotoma and the corresponding visible pathology on the retina.
The visual acuity requirement comprised better than 20/400 Snellen equivalent and a documented central scotoma in the better-seeing eye.
There were three adolescents who reported visual adverse events, which are not mentioned in the Ortho Tri-Cyclen label: a 14-year-old also on oxcarbazepine who was reported to have papilledema and cluster headache; a 16-year-old also on doxycycline and tretinoin, who had scotoma, blurred vision, headache and influenzalike illness; and a 16-year-old also on isotretinoin and prednisone, who had a vistual-field defect, in addition to benign intracranial hypertension and increased CSF pressure.
The features that were shown to be consistent with migraine were pounding pain, nausea, desire to lie down, periorbital pain, photophobia, and visual scotoma.
Three days after exposure, a central scotoma and decreased visual acuity developed in the right eye.
A transient ischemic attack aura starts suddenly, lasts from minutes to days, and has "negative" features such as scotoma and numbness.
White racist supremacy is the scotoma of Catholic theology.
Characteristic Right Eye Left Eye Normal or Near Normal 30 (60) 31 (62) Not Applicable 8 (16) 5 (10) (enucleation or no light perception) Not Measurable 3 (6) 1 (2) Field Constricted 3 (6) 3 (6) Paracentral Scotoma 0 (0) 2 (4) Left Hemianopsia with Macular Sparing 3 (6) 4 (8) Right Hemianopsia with Macular Sparing 0 (0) 1 (2) Left Hemianopsia with Macular Splitting 0 (0) 1 (2) Left Inferior Quadranopsia 1 (2) 0 (0) Left Superior Quadranopsia 1 (2) 0 (0) Superior Altitudinal Defect 1 (2) 1 (2) Table 2.
This means damage to one eye wouldn't remove an entire hemifield of vision as depicted by Scotoma 1 (see Figure 1).