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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 half of the brain has visual ...
Homonymous hemianopsia Paris as seen with left homonymous hemianopsia. A homonymous hemianopsia is the loss of half of the visual field on the same side in both eyes. The visual images that we see to the right side travel from both eyes to the left side of the brain, while the visual images we see to the left side in each eye travel to the ...
Ophthalmology. Quadrantanopia, quadrantanopsia, refers to an anopia (loss of vision) affecting a quarter of the visual field . It can be associated with a lesion of an optic radiation. [1] While quadrantanopia can be caused by lesions in the temporal and parietal lobes of the brain, it is most commonly associated with lesions in the occipital lobe.
Neurology. Middle cerebral artery syndrome is a condition whereby the blood supply from the middle cerebral artery (MCA) is restricted, leading to a reduction of the function of the portions of the brain supplied by that vessel: the lateral aspects of frontal, temporal and parietal lobes, the corona radiata, globus pallidus, caudate and putamen.
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 ...
Posterior cerebral artery syndrome is a condition whereby the blood supply from the posterior cerebral artery (PCA) is restricted, leading to a reduction of the function of the portions of the brain supplied by that vessel: the occipital lobe, the inferomedial temporal lobe, a large portion of the thalamus, and the upper brainstem and midbrain.
Congruous homonymous hemianopia with macular sparing is a feature of occlusion of posterior cerebral artery supplying the anterior part of the visual cortex. Bilateral homonymous hemianopia with macular sparing producing a picture of ring scotoma is seen in bilateral occipital lobe lesions. Pupillary reflex is normal; Optic atrophy does not occur.
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 .