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Posterior cortical atrophy (PCA), also called Benson's syndrome, is a rare form of dementia which is considered a visual variant or an atypical variant of Alzheimer's disease (AD). [1] [2] [3] The disease causes atrophy of the posterior part of the cerebral cortex, resulting in the progressive disruption of complex visual processing. [4]
Familial Danish dementia is an extremely rare, neurodegenerative disease characterized by progressive cataracts, loss of hearing, cerebellar ataxia, paranoid psychosis, and dementia. Neuropathological hallmarks include extensive atrophy of all areas of the brain, chronic diffuse encephalopathy , and the presence of exceedingly thin and nearly ...
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]
A new report drafted by experts lists 14 modifiable risk factors that may help prevent or slow down dementia, including two new additions: high cholesterol and eye problems. ... maps, causes and ...
At some point—usually as you enter middle age—most people develop this eye condition, which is a clouding of the eye’s lens that can get progressively worse and impair your vision.
Presbyopia. The cause of presbyopia is lens hardening by decreasing levels of α-crystallin, a process which may be sped up by higher temperatures. [11] It results in a near point greater than 25 cm [12] (or equivalently, less than 4 diopters).
Age-related cataracts are responsible for 51% of world blindness, about 20 million people. [68] Globally, cataracts cause moderate to severe disability in 53.8 million (2004), 52.2 million of whom are in low and middle income countries. [69] In many countries, surgical services are inadequate, and cataracts remain the leading cause of blindness ...
Index: Age related changes in refractive index (cortical sclerosis) can cause hypermetropia. Another cause of index hypermetropia is diabetes. [2] Occasionally, mild hypermetropic shift may be seen in association with cortical or subcapsular cataract also. [12] Positional: Positional hypermetropia occur due to posterior dislocation of Lens or ...