Visual field defect
Visual Field Defect
A Visual Field Defect (pronounced: vɪʒ.uː.əl fiːld dɪˈfɛkt) is a term used in ophthalmology and optometry to describe a decrease in vision or blindness (anopsia) in a portion of the visual field.
Etymology
The term "Visual Field Defect" is derived from the Latin words 'visus' meaning sight, 'field' meaning open land, and 'defectus' meaning failure.
Types of Visual Field Defects
There are several types of visual field defects, including:
- Hemianopia: This is a visual field defect that results in blindness in half of the visual field. It can be further classified into homonymous hemianopia and heteronymous hemianopia.
- Quadrantanopia: This is a type of visual field defect that results in blindness in a quarter of the visual field.
- Scotoma: This is a visual field defect that results in a blind spot in the visual field.
- Bitemporal hemianopia: This is a visual field defect that results in blindness in the outer (temporal) half of the visual field in both eyes.
Causes
Visual field defects can be caused by a variety of conditions, including:
- Glaucoma: This is a condition that damages the eye's optic nerve and can result in visual field defects.
- Stroke: A stroke can cause damage to the brain that can result in visual field defects.
- Brain tumor: A brain tumor can put pressure on the optic nerve or other parts of the brain involved in vision, resulting in visual field defects.
- Retinal detachment: This is a medical emergency where the retina pulls away from the back of the eye, which can result in visual field defects.
Diagnosis
Visual field defects are typically diagnosed using a Visual field test, which can help to determine the full extent of the defect.
Treatment
Treatment for visual field defects depends on the underlying cause. This can include medication, surgery, or vision therapy.
External links
- Medical encyclopedia article on Visual field defect
- Wikipedia's article - Visual field defect
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