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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]
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 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 ...
A vision disorder is an impairment of the sense of vision.. Vision disorder is not the same as an eye disease.Although many vision disorders do have their immediate cause in the eye, there are many other causes that may occur at other locations in the optic pathway.
Agnosias are sensory modality specific, usually classified as visual, auditory, or tactile. [2] [3] Associative visual agnosia refers to a subtype of visual agnosia, which was labeled by Lissauer (1890), as an inability to connect the visual percept (mental representation of something being perceived through the senses) with its related semantic information stored in memory, such as, its name ...
Visual apperceptive agnosia is a visual impairment that results in a patient's inability to name objects. [9] While agnosics suffer from severe deficits, patients' visual acuity and other visual abilities such as perceiving parts and colours remain intact. [6] Deficits seem to occur because of damage to early-level perceptual processing. [9]
"For some people, it goes beyond the visual cortex," Broner says. "They have stroke-like symptoms where the words aren't coming out right or it sounds garbled," she explains. They might also have ...
This form of myopia gets progressively worse over time. Degenerative myopia has been reported as one of the main causes of visual impairment. [72] Pseudomyopia is the blurring of distance vision brought about by spasm of the accommodation system. [73]