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Magnetic resonance imaging. Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes. Homonymous hemianopsia(or homonymous hemianopia) is hemianopic visual field loss on the same side of both eyes. Homonymous hemianopsia occurs because the right ...
Hemianopsia. Hemianopsia. Paris as seen with full visual fields. Specialty. Ophthalmology, neurology. Hemianopsia, or hemianopia, is a loss of vision or blindness ( anopsia) in half the visual field, usually on one side of the vertical midline. The most common causes of this damage are stroke, brain tumor, and trauma.
Visual pathway lesions; Visual pathway lesions From top to bottom: 1. Complete loss of vision in the right eye 2. Bitemporal hemianopia 3. Homonymous hemianopia 4. Quadrantanopia 5.& 6. Quadrantanopia with macular sparing: Specialty: Ophthalmology, Neuro-ophthalmology, Neurology: Symptoms: Loss of vision, Visual field defects, and Blindness ...
If a lesion only exists in one unilateral division of the optic radiation, the consequence is called quadrantanopia, which implies that only the respective superior or inferior quadrant of the visual field is affected. If both divisions on one side of the brain are affected, the result is a contralateral homonymous hemianopsia.
Specialty. Ophthalmology. Binasal hemianopsia is the medical description of a type of partial blindness where vision is missing in the inner half of both the right and left visual field. It is associated with certain lesions of the eye and of the central nervous system, such as congenital hydrocephalus .
Lesions in the optic tract correspond to visual field loss on the left or right half of the vertical midline, also known as homonymous hemianopsia. A lesion in the left optic tract will cause right-sided homonymous hemianopsia, while a lesion in the right optic tract will cause left-sided homonymous hemianopsia.
2. Bitemporal hemianopia 3. Homonymous hemianopia 4. Quadrantanopia 5. & 6. Quadrantanopia with macular sparing. The visual pathway consists of structures that carry visual information from the retina to the brain. Lesions in the pathway cause a variety of visual field defects. The type of field defect can help localize where the lesion is ...
Anopsia. Scheme showing central connections of the optic nerves and optic tracts. (Lesions at different locations relate to different types of anopsias.) An anopsia (from Ancient Greek ἀν- (an-) 'without' and ὄψις (opsis) 'sight') is a defect in the visual field. If the defect is only partial, then the portion of the field with the ...