Visual field test¶
A perimetry examination mapping visual sensitivity across a patient's field of view.
Core Idea¶
A visual field test measures where and at what sensitivity a person detects visual stimuli while fixation is held at a specified point. By presenting targets at controlled locations, sizes, luminances, colors, or motion patterns, the examination samples central and peripheral vision and maps areas of reduced or absent sensitivity. The resulting field is a spatial function of detection performance, not a photograph of the retina and not simply a test of central visual acuity.
Scope of Application¶
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Glaucoma. Repeated automated perimetry maps characteristic loss and progression when protocols and reliability remain comparable.
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Retinal disease. Central and peripheral tests relate functional loss to retinal pathology, with microperimetry adding fixation-linked localization.
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Optic-nerve disease. Defect patterns help characterize functional consequences but do not determine cause by themselves.
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Chiasmal and post-chiasmal lesions. Bilateral field patterns can support neuroanatomical localization alongside imaging and examination.
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Toxicity and treatment monitoring. Serial testing can track medication or disease effects using matched stimulus and threshold protocols.
Clarity¶
Visual field test denotes a family of procedures that map visual sensitivity across retinal locations, not a single instrument or a generic eyesight check. Clarity requires the perimetric method, stimulus size and intensity, background, eye tested, reliability indices, and reference database. Naming these elements separates true localized loss from poor fixation, learning effects, fatigue, or optical blur.
Manages Complexity¶
A visual field test reduces responses to many localized stimuli into a map of sensitivity and a few reliability and summary indices. The clinician tracks location, threshold deviation from a reference population, pattern of neighboring defects, fixation loss, false responses, and change across repeat examinations. Those quantities route findings toward diffuse depression, focal scotoma, hemifield pattern, artifact, or unreliable study without reinterpreting every flash in isolation.
Abstract Reasoning¶
Pattern-localization move. From a repeatable cluster of depressed field locations, infer a candidate retinal, optic-nerve, chiasmal, retrochiasmal, or nonorganic pattern according to anatomy. Reliability move. Use fixation and false-response indices plus internal consistency to decide whether the map warrants interpretation. Progression move. Compare examinations under the same protocol to infer stable, improving, or worsening loss from spatially coherent change, not one fluctuating point. Boundary move. Diffuse depression can reflect optical blur, media opacity, fatigue, or technique; global indices and pattern maps must be read together before attributing disease.
Knowledge Transfer¶
Within the home domain. Visual-field testing transfers across glaucoma, neurologic disease, retinal disorders, occupational screening, and rehabilitation when stimuli are systematically presented across space to estimate sensitivity. Fixation control, threshold strategy, reliability indices, defect pattern, and longitudinal change retain clinical meaning. Beyond the home domain (C — diagnostic instrument). The general mapping method can be applied wherever spatial detection thresholds are measured, but literal visual-field claims require a visual observer and calibrated apparatus.
Relationships to Other Abstractions¶
Current abstraction Visual field test Domain-specific
Parents (1) — more general patterns this builds on
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Visual field test is a kind of Evaluation Prime
Visual field test is a domain-specific kind of Evaluation: A perimetry examination mapping visual sensitivity across a patient's field of view.
Hierarchy path (1) — routes to 1 parentless root
- Visual field test → Evaluation → Comparison → Self Checking
Neighborhood in Abstraction Space¶
Visual field test sits in a sparse region of the domain-specific corpus (68th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Unclustered & Miscellaneous (2551 abstractions)
Nearest neighbors
- Cover test — 0.88
- Form Perception — 0.84
- Simon Effect — 0.84
- Swedish Interactive Thresholding Algorithm — 0.83
- Defocus Aberration — 0.83
Computed from structural-signature embeddings · 2026-10-08