Hemianopsia
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Hemianopsia
Hemianopsia (pronounced hee-mee-uh-NOH-pee-uh), also known as hemianopia, is a type of visual field loss that results in blindness in half of the visual field. It is often caused by stroke, brain tumor, or trauma to the brain.
Etymology
The term "hemianopsia" is derived from the Greek words "hemi" meaning "half", "an" meaning "without", and "opsia" meaning "seeing".
Types of Hemianopsia
There are several types of hemianopsia, including:
- Homonymous hemianopsia: This is the most common type of hemianopsia, where the same half of the visual field is lost in both eyes.
- Binasal hemianopsia: This type involves loss of vision in the inner or nasal half of the visual field in both eyes.
- Bitemporal hemianopsia: This type involves loss of vision in the outer or temporal half of the visual field in both eyes.
Related Terms
- Visual field: The total area that can be seen when the eyes are focused on a central point.
- Visual field test: A test used to measure the extent and distribution of the field of vision.
- Quadrantanopia: A condition where a quarter of the visual field is lost.
- Scotoma: A blind spot in the visual field.
See Also
References
External links
- Medical encyclopedia article on Hemianopsia
- Wikipedia's article - Hemianopsia
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