Confrontation Visual Field Screen
Learn confrontation visual field testing techniques, exam traps and localization clues for rapid neuro-ophthalmic screening.
How should confrontation visual field testing be performed?
Confrontation Visual Field Testing in 30 Seconds
Confrontation visual field testing rapidly compares the patient's visual field with that of an examiner presumed to have a normal visual field. It detects gross defects, asymmetry and visual extinction. It cannot replace formal perimetry when localization, quantification or serial measurement matters.
How the Test Works
Test one eye at a time while the fellow eye is occluded. Sit at roughly arm's length and have the patient fixate on your open eye directly opposite the eye being tested. Compare finger counting or finger wiggle in all four quadrants. This is a fast gross screen, not a quantitative test. Use it at the bedside, emergency department, or inpatient settings, when cooperation limits perimetry, or before automated perimetry.
Techniques and Their Uses
- Static finger counting or a stationary target in each quadrant: general screening for dense or large defects. Finger counting or a stationary target is generally more reproducible than finger wiggle, although finger wiggle remains widely used as a rapid bedside screen.
- Finger wiggle in the periphery: peripheral field assessment and detection of severe generalized constriction.
- Red target comparison or color desaturation testing: assesses relative color desaturation, useful for subtle optic nerve dysfunction and asymmetric visual pathway disease.
- Simultaneous double stimulation: visual extinction that suggests contralateral parietal lobe dysfunction, classically right parietal dysfunction causing left extinction.
- Kinetic confrontation testing, moving a target from a nonseeing to a seeing area, can help define the edge of a suspected field defect.
Quick Comparison
| Technique | Best For | Limitation |
|---|---|---|
| Finger counting | Dense focal defects | Misses subtle loss |
| Static target | Gross hemianopias | Less sensitive for small scotomas |
| Finger wiggle | Peripheral screening | Variable between examiners |
| Red target comparison | Optic neuropathy | Subjective |
| Double simultaneous stimulation | Extinction, parietal lesions | Does not assess primary field loss |
4 Facts Exams Always Ask
- Confrontation testing has good sensitivity for large, dense field defects but poor sensitivity for subtle, early, or small defects.
- It is most useful with poor cooperation, in bedside, emergency, or inpatient settings, and as a rapid screen before formal perimetry.
- Test extinction by presenting stimuli separately, then simultaneously in corresponding hemifields. Failure to perceive one stimulus only during bilateral presentation suggests parietal dysfunction, not a primary visual pathway defect.
- The examiner's normal visual field is the internal reference standard. Do not use this comparison method if the examiner has an abnormal field.
The Classic Trap
Do not equate a normal confrontation field with a normal formal visual field. Formal perimetry can reveal defects missed by confrontation testing. Also separate extinction from a true hemifield defect. Extinction appears only with simultaneous bilateral stimulation and points to impaired cortical attention, usually from contralateral parietal dysfunction.
Clinical Pearl
Extinction reflects impaired visual attention rather than primary visual pathway damage and therefore localizes differently from a true homonymous hemianopia. A patient who detects a left sided stimulus alone but misses it when right and left stimuli appear together has extinction, a finding that can be more localizing than a simple report of left field loss.
Checkpoint 1
Which technique specifically tests for visual extinction?
Checkpoint 2
A patient detects a stimulus in each hemifield when tested separately but fails to detect the left-sided stimulus when both are presented simultaneously. What does this finding suggest?
A hospitalized patient fixates on your nose. He detects finger wiggle in each hemifield when tested separately. When you wiggle fingers simultaneously in both hemifields, he reports only the right sided stimulus. Finger counting is full in all quadrants when each eye is tested separately.
What is the most likely explanation for this finding?
Sources & Reviewer Info
Diagram created with AI image generation, clinically reviewed for accuracy.
References
- American Academy of Ophthalmology. Basic and Clinical Science Course, Section 5: Neuro-Ophthalmology.
- Walsh and Hoyt's Clinical Neuro-Ophthalmology.
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