What does scotoma mean?

Definitions for scotoma
skoʊˈtoʊ mə; -mə təsco·toma

This dictionary definitions page includes all the possible meanings, example usage and translations of the word scotoma.

Princeton's WordNet

  1. scotomanoun

    an isolated area of diminished vision within the visual field

Wiktionary

  1. scotomanoun

    an area of impaired or lost vision within a field of vision otherwise in a good (or at least healthy) state

  2. Etymology: From scotoma, from σκότωμα, from σκότος.

Wikipedia

  1. Scotoma

    A scotoma is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. Every normal mammalian eye has a scotoma in its field of vision, usually termed its blind spot. This is a location with no photoreceptor cells, where the retinal ganglion cell axons that compose the optic nerve exit the retina. This location is called the optic disc. There is no direct conscious awareness of visual scotomas. They are simply regions of reduced information within the visual field. Rather than recognizing an incomplete image, patients with scotomas report that things "disappear" on them.The presence of the blind spot scotoma can be demonstrated subjectively by covering one eye, carefully holding fixation with the open eye, and placing an object (such as one's thumb) in the lateral and horizontal visual field, about 15 degrees from fixation (see the blind spot article). The size of the monocular scotoma is 5×7 degrees of visual angle. A scotoma can be a symptom of damage to any part of the visual system, such as retinal damage from exposure to high-powered lasers, macular degeneration and brain damage. The term scotoma is also used metaphorically in several fields. The common theme of all the figurative senses is of a gap not in visual function but in the mind's perception, cognition, or world view. The term is from Greek σκότος/skótos, "darkness."

ChatGPT

  1. scotoma

    A scotoma is a confined area of partial alteration in field of vision consisting usually of a partially diminished or entirely depressed visual sensitivity with a variable amount of visual function remaining. This visual impairment may result from damage or disease of the retina or other parts of the eye, the optic nerve, or the brain.

Webster Dictionary

  1. Scotomanoun

    scotomy

  2. Etymology: [L.]

Wikidata

  1. Scotoma

    A scotoma is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. Every normal mammalian eye has a scotoma in its field of vision, usually termed its blind spot. This is a location with no photoreceptor cells, where the retinal ganglion cell axons that comprise the optic nerve exit the retina. This location is called the optic disc. When both eyes are open, visual signals that are absent in the blind spot of one eye are provided from the opposite visual cortex for the other eye, even when the other eye is closed. The absence of visual imagery from the blind spot does not intrude into consciousness with one eye closed, because the corresponding visual field locations of the optic discs in the two eyes differ. The presence of the scotoma can be demonstrated subjectively by covering one eye, carefully holding fixation with the open eye, and placing an object in the lateral and horizontal visual field, about 15 degrees from fixation. The size of the monocular scotoma is 5×7 degrees of visual angle.

U.S. National Library of Medicine

  1. Scotoma

    A localized defect in the visual field bordered by an area of normal vision. This occurs with a variety of EYE DISEASES (e.g., RETINAL DISEASES and GLAUCOMA); OPTIC NERVE DISEASES, and other conditions.

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Numerology

  1. Chaldean Numerology

    The numerical value of scotoma in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of scotoma in Pythagorean Numerology is: 5

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"scotoma." Definitions.net. STANDS4 LLC, 2024. Web. 19 Mar. 2024. <https://www.definitions.net/definition/scotoma>.

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