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Related Concept Videos

Visual Agnosia01:12

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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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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials
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Functional Visual Impairments from Concussion.

Raechaell Corbett1

  • 1Supervisor Driver Assessment Program, Lions Low Vision Center, Outpatient Medical Rehab, Easterseals of Greater Waterbury, 158 State Street, Meriden, CT 06450, USA.

Clinics in Sports Medicine
|March 5, 2026
PubMed
Summary

Concussions often cause visual problems like eye fatigue and blurry vision, leading to dizziness and nausea. Occupational therapy helps assess and treat these visual issues to improve daily functioning after a concussion.

Keywords:
Blurry visionImpaired focusOccupational therapyVestibular ocular reflexVisual impairment

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Rehabilitation Medicine

Background:

  • Concussions can cause significant visual disturbances.
  • Symptoms include eye fatigue, blurry vision, double vision, and impaired eye movements.
  • These visual issues can lead to nausea, dizziness, and difficulty with daily activities.

Purpose of the Study:

  • To highlight the impact of concussion-related visual impairments on daily life.
  • To emphasize the role of occupational therapy in addressing these functional deficits.
  • To advocate for a multidisciplinary approach in concussion management.

Main Methods:

  • The abstract describes common visual symptoms following concussion.
  • It discusses the functional impact of dysregulated visual-vestibular interaction.
  • It highlights the potential of occupational therapy interventions.

Main Results:

  • Visual skill deficits are common after concussion.
  • Impaired visual-vestibular coordination affects daily activities like reading and driving.
  • Occupational therapy is identified as a key component in treatment.

Conclusions:

  • Functional visual impairments are a significant consequence of concussion.
  • Occupational therapy offers valuable assessment and treatment for these visual issues.
  • A multidisciplinary team approach is crucial for effective concussion recovery.