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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 ...
He never experienced losses in subjective best-corrected acuity, color vision or stereopsis. This case is interesting because the astronaut did not have disc edema or choroidal folds, but was documented to have nerve fiber layer (NFL) thickening, globe flattening, a hyperopic shift and subjective complaints of loss of near vision. [5]
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 ]
It is suspected that an atypical form of Alzheimer's disease is the most common cause of logopenic progressive aphasia. [ 3 ] [ 4 ] Although patients with the logopenic variant of PPA are still able to produce speech, their speech rate may be significantly slowed due to word retrieval difficulty. [ 4 ]
This increase in response time is greater for older adults than for younger adults, suggesting that attention allocation over trials is sensitive to age-related decline, and therefore it is possible that there is an age-related decline in ability to switch between a situation that requires the use of inhibitory processes and situations that do ...
The absence of this lens left the patient highly hyperopic (farsighted) in that eye. For some patients the removal was only performed on one eye, resulting in the anisometropia / aniseikonia. Today, this is rarely a problem because when the lens is removed in cataract surgery , an intraocular lens , or IOL is left in its place.
Issues with episodic memory — memory for events in time or if a person doesn’t remember going shopping, for example — can be a sign of a progressive disorder, but not always.
When refractive errors in children are not treated, the child may be at risk of developing ambylopia, where vision may remain permanently blurry. [33] Because young children typically do not complain of blurry vision, the American Academy of Pediatrics recommends that children have yearly vision screening starting at three years old so that unknown refractive errors or other ophthalmic ...
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