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Cortical visual impairment (CVI) is a form of visual impairment that is caused by a Brain problem rather than an Eye problem. (The latter is sometimes termed "ocular visual impairment" when discussed in contrast to cortical visual impairment.) Some people have both CVI and a form of ocular visual impairment.
Visual impairment is caused by factors including brain damage, vision loss, and others. [4] Of the vision rehabilitation techniques available, most center on neurological and physical approaches. According to the American Academy of Ophthalmology, "Provision of, or referral to, vision rehabilitation is now the standard of care for all who ...
NVI and its three subtypes—cortical blindness, cortical visual impairment, and delayed visual maturation—must be distinguished from ocular visual impairment in terms of their different causes and structural foci, the brain and the eye respectively. One diagnostic marker of this distinction is that the pupils of individuals with cortical ...
The most frequently observed problems related to a cerebral arteriovenous malformation (AVM) are headaches and seizures, cranial nerve afflictions including pinched nerve and palsy, [2] [3] backaches, neckaches, and nausea from coagulated blood that has made its way down to be dissolved in the cerebrospinal fluid.
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Furthermore, treatment of underlying conditions that caused the visual loss could also remove or improve CBS associated symptoms. [ 15 ] [ 16 ] Those experiencing severe symptoms can also utilize behavior techniques such as repeated blinking during hallucinations, rapid eye movement from one object to another and bright lighting to engage the ...
Vascular and neoplastic (malignant or benign tumours) lesions from the optic tract, to visual cortex can cause a contralateral homonymous hemianopsia. Injury to the right side of the brain will affect the left visual fields of each eye. The more posterior the cerebral lesion, the more symmetric (congruous) the homonymous hemianopsia will be.
Visual agnosia is an impairment in recognition of visually presented objects. It is not due to a deficit in vision (acuity, visual field, and scanning), language, memory, or intellect. [ 1 ] While cortical blindness results from lesions to primary visual cortex, visual agnosia is often due to damage to more anterior cortex such as the posterior ...