What is a scotoma mean?
Table of Contents
What is a scotoma mean?
Definition of scotoma : a spot in the visual field in which vision is absent or deficient.
Can scotoma go away?
A scotoma that happens before a migraine headache is temporary and usually goes away within an hour. If the scotoma is on the outer edges of your vision, it usually does not cause severe vision problems.
Can scotoma cause blindness?
The absence of vision may or may not progress across the visual field. Retinal migraine may result in the same type of visual deficit (negative aura); however, positive scotoma or blindness is also possible.
What is a scotoma in literature?
Notes. 1 A scotoma is a blind spot in what is normal vision. Since readers might not be familiar with the meaning of scotoma, this obscure word becomes the symbol of a blind spot. 2 This paper will refer to an observer in keeping with the literature.
What is the types of scotoma?
A central scotoma is a blind spot directly in the center of your vision (directly in your line of sight). Central scotomas are some of the most devastating visual field defects because they can make reading, driving and recognizing faces difficult or impossible.
Why does scotoma occur?
The most common causes of central scotomas are disorders of the optic nerve, choroid or retina, such as macular degeneration. Eye infections that result in a scar or strokes, tumors, and traumatic brain injuries may result in this type of vision loss.
What triggers scotoma?
Scintillating scotomas are typically caused by what’s known as cortical spreading depression. Basically, this is abnormal electrical activity moving through your brain. These electrical impulses may be related to high blood pressure, inflammation, or hormonal fluctuations, among other things.
Can glaucoma cause scotoma?
Glaucoma and diabetic retinopathy can cause paracentral scotomas. In the case of glaucoma, the scotoma may be arc-shaped and therefore called an arcuate scotoma. A paracentral scotoma may occur by itself or there may be more than one of these blind spots in your vision.
What do people with scotomas see?
The presence of the blind spot scotoma can be demonstrated subjectively by covering one eye, carefully holding fixation with the open eye, and placing an object (such as one’s thumb) in the lateral and horizontal visual field, about 15 degrees from fixation (see the blind spot article)….
| Scotoma | |
|---|---|
| Specialty | Ophthalmology |
Does everyone have a scotoma?
You may not realize it, but both your eyes have a natural blind spot, or scotoma. Everyone has them. They’re normal and you probably don’t notice them.
How does scotoma occur?
How do you get a scotoma?
What are the primary causes of a scintillating scotoma?
- migraine with aura.
- visual or ocular migraine without headache pain.
- seizure.
- stroke.
- MS.
- glaucoma.
- stress.
- head injury.