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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]
Dyslexia, previously known as word blindness, is a learning disability that affects either reading or writing. [ 1 ] [ 6 ] Different people are affected to different degrees. [ 3 ] Problems may include difficulties in spelling words, reading quickly, writing words , "sounding out" words in the head , pronouncing words when reading aloud and ...
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 occipital and/or temporal lobe(s) in the brain. [2]
It occurs in a small number of children and generally is not found in adults. [14] The popular culture concept of photographic memory—where, for example, someone can briefly look at a page of text and then recite it perfectly from memory—is not the same as seeing eidetic images, and photographic memory has never been demonstrated to exist.
Childhood blindness is an important contribution to the national prevalence of the disability of blindness. [3] Blindness in children can be defined as a visual acuity of <3/60 in the eye with better vision of a child under 16 years of age. [4]
Childhood cataracts are the primary cause of childhood blindness. [4] Childhood cataracts make up 7.4% to 15.3% of blindness in kids. [4] The prevalence of childhood cataracts ranges from 0.63/10,000 to 9.74/10,000 children, with a median of 1.71. [6] This is dependent on factors like economic status but not gender or laterality. [6]
The following criteria are required to classify an event as an inattentional blindness episode: 1) the observer must fail to notice a visual object or event, 2) the object or event must be fully visible, 3) observers must be able to readily identify the object if they are consciously perceiving it, [3] and 4) the event must be unexpected and the failure to see the object or event must be due ...
The difference in memory between normal aging and a memory disorder is the amount of beta-amyloid deposits, hippocampal neurofibrillary tangles, or amyloid plaques in the cortex. If there is an increased amount, memory connections become blocked, memory functions decrease much more than what is normal for that age and a memory disorder is ...