central scotoma

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Thân thiện
Definition

Noun: A central scotoma is a specific type of scotoma—an area of partial or complete loss of vision—that directly involves the fixation point. The fixation point is the central point of the visual field that the eye focuses on. This condition results in a blind spot or area of diminished vision in the very center of one's sight.

Usage and Examples
  • Noun:
    • The patient was diagnosed with a central scotoma, making it difficult for him to read or recognize faces directly.
    • A central scotoma often affects tasks requiring fine detail, as it obscures the central point of focus.
Advanced Usage
  • Clinical Context: In ophthalmology and optometry, a central scotoma is a key diagnostic finding associated with conditions affecting the macula or optic nerve, such as age-related macular degeneration or optic neuritis.
    • The presence of a central scotoma on the Amsler grid test is a strong indicator of macular pathology.
Variants and Related Words
  • Scotoma (n): The general term for an area of lost or impaired vision within the visual field.
  • Paracentral scotoma (n): A scotoma located near, but not directly involving, the fixation point.
  • Centrocecal scotoma (n): A scotoma that connects the fixation point to the blind spot.
Synonyms
  • Central blind spot: A more descriptive, non-technical synonym.
  • Fixation scotoma: A less common but accurate synonym emphasizing the involvement of the fixation point.
Related Phrases and Terms
  • Visual field defect: A broader category of conditions that includes scotomas.
  • Macular scotoma: A term often used interchangeably with central scotoma, as the macula is responsible for central vision.
Noun
  1. a scotoma that involves the fixation point

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