Scotoma


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

scotoma

[skə′tō·mə]
(medicine)
A blind spot or area of depressed vision in the visual field.

Scotoma

 

a blind area within the visual field, not affecting the surrounding area of the eye. Physiologic scotoma is that area of a healthy eye’s visual field corresponding with the optic disk, which does not have photoreceptors. Pathologic scotoma is a diagnostic symptom of many diseases, including retinitis and atrophy of the optic nerve. It is perceived as a dark spot (positive scotoma) or as a blank spot (negative scotoma) that can be detected only through special testing. During teichopsia (scintillating scotoma), which lasts 20–30 minutes, flickering is perceived along the eye’s periphery; the condition is usually accompanied by persistent headaches, nausea, and vomiting. Treatment of scotoma is directed toward the underlying disease.

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An analysis of 132 images indicated that many people wear the device near or overlapping their pupillary axis (a line perpendicular to the surface of the cornea, passing through the center of the pupil), which may induce scotomas and interfere with daily function.
The characteristics of the scotoma and PRL were measured with a Scanning Laser Ophthalmoscope (SLO; SLO-101, Rodenstock, Dusseldorf, Germany).
First, however, he had his listeners do an exercise that showed how every-one has scotomas, or blind spots.
2007) showed that individuals with Stargardt's disease often choose an area below the scotoma.
Optic neuritis is bilateral and severe or associated with a swollen optic nerve or chiasm lesion or an altitudinal scotoma.
These patients will manifest with a motor deficit on the opposite side of the body usually affecting the upper limb and in many cases associated with an ipsilateral visual disturbance, either complete blindness (amaurosis) or a scotoma, i.
3% of affected eyes had central or centrocecal scotoma, and altitudinal or other nerve-fibre bundle-type defects were present in 20.
Two years later, the right scotoma remained unchanged.
There were three adolescents who did report visual adverse events, which are not mentioned in the Ortho Tri-Cyclen product label: a 14-year-old patient also on oxcarbazepine who was reported to have papilledema and cluster headache; a 16-year old patient also on doxycycline and tretinoin, who experienced scotoma, blurred vision, headache and influenza-like illness; and a 16-year old patient also on isotretinoin and prednisone, who had a visual-field defect, in addition to benign intracranial hypertension and increased cerebrospinal fluid pressure.
This tradition might have something exciting and radical to teach us and the wider world that would propel us all out of the scotosis and scotoma that Longeran diagnosed and that Jon Nilson explores in this volume.
Damage to this area from diseases, such as age-related macular degeneration (AMD), causes the loss of central vision in the form of a central scotoma (Kanski, 2008).