hemianopic scotoma

Thân thiện

A patient's hemianopic scotoma is tested using a visual field perimeter.

Definition

Noun: A hemianopic scotoma is a specific type of vision loss or blind spot (scotoma) that affects one half of the visual field. This means the area of vision loss is not a small spot but a large, well-defined region covering either the left or right half of what a person can see.

Usage

This term is used in medical and clinical contexts, particularly in ophthalmology and neurology, to describe a diagnostic finding. - It is typically used as a countable noun (e.g., a hemianopic scotoma, hemianopic scotomas). - It describes a symptom or sign resulting from damage to specific neural pathways in the visual system, often in the optic tract or occipital lobe.

Examples

• The MRI results, combined with the patient's visual field test, confirmed the presence of a hemianopic scotoma.
• Strokes affecting the primary visual cortex can cause hemianopic scotomas.
• The neurologist noted that the hemianopic scotoma was congruous, suggesting a lesion in the occipital lobe.

Advanced Usage

• Adjectival Use: The term itself is often used attributively to modify other nouns, as in "hemianopic scotoma detection" or "hemianopic scotoma patient."
• Clinical Description: It is frequently specified further by the affected side (e.g., ) or by its congruity (how identical the blind spot is in both eyes).

Variants and Related Words

• Scotoma (n.): The general term for an area of partial or complete loss of vision within the visual field.
• Hemianopia (n.) / Hemianopsia (n.): A broader term for blindness in one half of the visual field; a hemianopic scotoma is a type of hemianopia.
• Quadrantanopia (n.): Blindness in one quarter of the visual field, a related but less extensive condition.

Synonyms

• Hemianopic defect: A less common but synonymous phrase.
• Half-field visual loss: A descriptive, non-technical synonym.

Related Phrases / Compound Terms

• Homonymous hemianopic scotoma: A scotoma affecting the same half (both left or both right) of the visual field in each eye.
• Bitemporal hemianopic scotoma: A scotoma affecting the outer (temporal) halves of the visual field in both eyes, often associated with pituitary gland issues.

Học thuật

Noun

1. a scotoma involving half of the visual field