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Visual phenomena, disturbances, and hallucinations

D T Adamczyk1

  • 1Primary Care Service, State University of New York, State College of Optometry, New York, USA.

Optometry Clinics : the Official Publication of the Prentice Society
|January 1, 1996
PubMed
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The visual system processes information normally or abnormally due to disorders. Understanding these visual phenomena is crucial for proper patient care and treatment.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • The visual system processes sensory information, which can be normal or indicative of disorders.
  • Visual disturbances range from normal entoptic phenomena to pathological conditions like metamorphopsia and scotomas.

Purpose of the Study:

  • To discuss various visual phenomena, disturbances, and hallucinations.
  • To differentiate numerous visual presentations for appropriate clinical management.

Main Methods:

  • Review of visual system functions and disruptions.
  • Categorization of visual phenomena including entoptic phenomena, illusions, and hallucinations.

Main Results:

  • Normal visual images are termed entoptic phenomena.

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  • Disruptions can cause metamorphopsia, transient vision loss, and positive scotomas due to retinal, optic nerve, neurological diseases, or drug side effects.
  • Incorrect perception (illusions) or generation of non-existent images (hallucinations) can occur.

    • Conclusions:

    • Accurate differentiation of visual presentations is essential for effective treatment, management, and patient education.
    • Understanding the spectrum of visual phenomena aids in diagnosing underlying causes.