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Visual Field Defects (Patterns)

Patterns of vision loss that help localize where in the visual pathway damage has occurred.

3 min read

Visual field defects are patterns of vision loss that help identify where in the visual pathway damage has occurred. Different locations cause characteristic patterns.

Key Takeaways

  • Pattern reveals location of damage
  • Helps diagnose underlying condition
  • Monitored with visual field testing
  • May be noticed by patient or found on testing
  • Important for tracking progression

Common Patterns

Central Scotoma

Illustration of central scotoma showing a dark blind spot in the center of vision

Arcuate Defect

Altitudinal Defect

  • Loss of upper or lower half of vision
  • Causes: ischemic optic neuropathy, branch retinal artery occlusion
  • Respects horizontal midline

Hemianopia

Illustration of hemianopia showing the left half of vision blocked out
  • Loss of right or left half of vision
  • Homonymous-same side affected in both eyes (brain lesion)
  • Causes: stroke, tumor, trauma

Bitemporal Hemianopia

  • Outer (temporal) fields lost in both eyes
  • Causes: pituitary tumor, chiasmal compression
  • Affects both outer visual fields

Quadrantanopia

  • One quarter of visual field affected
  • Localizes to specific area of visual pathway

Generalized Constriction

Localization

Defect Location
Central scotoma Optic nerve, macula
Bitemporal hemianopia Optic chiasm
Homonymous hemianopia Brain (opposite side)
Altitudinal Optic nerve, retina

Monitoring

Regular visual field testing tracks:

  • Stability vs progression
  • Response to treatment
  • Need for intervention

How to Use the Pattern

The pattern is a clue, not a final diagnosis. A central scotoma may come from the optic nerve or macula, so OCT and a dilated retinal exam matter. A bitemporal hemianopia points to the chiasm and usually triggers MRI. A homonymous hemianopia points behind the chiasm and is often evaluated as a brain or stroke problem.

Reliability also matters. Fatigue, droopy lids, lens rim artifact, poor fixation, and learning effect can create misleading defects, so doctors often repeat tests before calling a subtle change real.

Frequently Asked Questions

Does a visual field defect mean I am going blind?

Not necessarily. Some defects are stable, some improve, and some need urgent treatment. The cause, pattern, and trend over time are what determine risk.

Why did my doctor repeat the same visual field test?

Repeat testing helps confirm whether a defect is real and whether it is changing. First tests are often less reliable because the task is unfamiliar.

Can a normal eye exam miss a field defect?

Yes. Many field defects are not obvious from a basic eye chart. Formal visual field testing maps areas away from the exact center of vision.

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