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Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Dementia l: Introduction01:22

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Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Alzheimer Disease l: Introduction01:29

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Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Vision function abnormalities in Alzheimer disease.

Radouil Tzekov1, Michael Mullan2

  • 1The Roskamp Institute, Sarasota, Florida; Department of Ophthalmology, University of South Florida, Tampa, Florida.

Survey of Ophthalmology
|December 7, 2013
PubMed
Summary
This summary is machine-generated.

Alzheimer disease (AD) affects the entire visual system, not just the brain. Research shows the optic nerve and retina are also impacted, offering new insights for ophthalmologists.

Keywords:
Alzheimer diseaseearly diagnosiselectrophysiologyhumansimagingoptic nervepathophysiologypsychophysicsretina

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Gerontology

Background:

  • Alzheimer disease (AD) is a progressive, age-related condition with increasing public health implications.
  • Visual system abnormalities in AD were historically attributed solely to cortical dysfunction.
  • Recent research indicates broader visual system involvement in AD, extending beyond the cortex.

Purpose of the Study:

  • To review and synthesize current findings on visual system abnormalities in Alzheimer disease.
  • To highlight aspects of AD's impact on vision relevant to clinical ophthalmology.
  • To focus on practical implications for ophthalmologists managing AD patients.

Main Methods:

  • Review of studies published within the last 20 years.
  • Focus on research investigating the retina and optic nerve in Alzheimer disease.
  • Synthesis of findings with clinical relevance for ophthalmologists.

Main Results:

  • Alzheimer disease affects multiple components of the visual system, including the optic nerve and retina.
  • The precise mechanisms of visual system involvement in AD are still under active investigation.
  • Evidence suggests a wider range of ocular manifestations in AD than previously understood.

Conclusions:

  • Ophthalmologists should consider the impact of Alzheimer disease on the entire visual pathway.
  • Further research is needed to fully elucidate the complex relationship between AD and visual dysfunction.
  • Understanding these connections can lead to earlier detection and improved patient care in ophthalmology.