L12 Disorders of Vision

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Homonymous Hemianopia

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<p>Visual field loss on sides of both eyes, often resulting from damage to the optic tract or visual cortex.</p>

Visual field loss on sides of both eyes, often resulting from damage to the optic tract or visual cortex.

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Blindsight

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The ability to localise moving visual stimuli without “seeing” them, because info reaches the dorsal stream, bypassing primary visual cortex (V1), and reaching V5 (detects visual stimulus))

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Flashcards about Disorders of Vision

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Homonymous Hemianopia

Visual field loss on sides of both eyes, often resulting from damage to the optic tract or visual cortex.

<p>Visual field loss on sides of both eyes, often resulting from damage to the optic tract or visual cortex.</p>
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Blindsight

The ability to localise moving visual stimuli without “seeing” them, because info reaches the dorsal stream, bypassing primary visual cortex (V1), and reaching V5 (detects visual stimulus))

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Achromatopsia

the absence of color vision, typically resulting from damage to area V4 of the visual cortex or absence of cone photoreceptors (most common reason)

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Akinetopsia

the inability to perceive motion, usually due to damage to area V5/MT of the visual cortex.

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Visual Agnosia

impairment in the ability to recognize objects despite intact visual perception; the person can see the object but cannot name or understand it.

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Apperceptive Agnosia

type of visual agnosia, the failure to recognize objects due to bilateral damage to V1. Can percieve colour and movement. Poor copy and matching abilities.

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Peppery Mask Hypothesis

An explanation for apperceptive agnosia, suggesting that damage to V1 creates multiple blind spots (scotomas), they can see better when they move.

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Dorsal Simultagnosia

A form of visual agnosia where a person can only perceive one object at a time due to bilateral damage to the parietal lobes. Spatial perceptual impairment.

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Ventral Simultagnosia

A type of visual agnosia where a person can see multiple objects, but can only clearly recognize one at a time, damage to the ventral stream beyond V4. colour and motion perception intact.

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Associative Agnosia

A visual agnosia where a person can copy drawings accurately but cannot recognize the object. It involves a disconnect between perception and object association or meaning.