Confrontation visual field testing is the simplest visual field screening technique — performed with no equipment other than the examiner's own hands and eyes. Despite its simplicity, it reliably detects large field defects including hemianopias and dense quadrantanopias, making it an essential component of every comprehensive eye examination. For the paraoptometric, understanding confrontation field technique, normal results, and what different defect patterns indicate is fundamental knowledge for both the CPO and CPOA exams.
The power of confrontation testing lies in its accessibility and in understanding what different abnormal patterns mean. A bitemporal defect points to the optic chiasm. A monocular defect points to one eye or optic nerve. A homonymous defect (same side in both eyes) points to the post-chiasmal pathway in the brain. These localizing patterns allow the paraoptometric to recognize when a finding needs urgent escalation — even before formal perimetry is completed.
Confrontation Field Technique
Positioning
Sit directly in front of the patient, approximately 60-90cm (2-3 feet) away, at the same eye level. Good lighting. No bright light behind the examiner (silhouettes the hands).
Eye Patching
Patient covers one eye completely. Test one eye at a time. By convention, test right eye (OD) first, then left (OS).
Fixation
Patient fixates your opposite eye (examiner's left eye when testing patient's right eye). The examiner also closes their corresponding eye to use themselves as a reference.
Stimulus Presentation
Present fingers (1, 2, or 5) in the four quadrants: superior nasal, superior temporal, inferior nasal, inferior temporal. Keep fingers equidistant between you and the patient, at the same eccentricity in each quadrant. Ask: "How many fingers do you see?" or "Tell me when you first see movement."
Ask: How many fingers do you see?
Simultaneous Stimulation
Also test simultaneous bilateral stimulation: present fingers in both temporal fields simultaneously. A patient who sees each temporal field independently but misses one side when both are presented simultaneously may have visual extinction from cortical lesion.
Central vs Peripheral
For suspected macular disease, test central field specifically — ask patient to fixate your nose and report any blank spot or distortion around fixation. This supplements the Amsler grid test.
Documentation
Record: "Confrontation fields full to finger counting OD and OS" (normal) or describe defect specifically: "Left homonymous superior quadrantanopia on confrontation" (abnormal). Trigger automated perimetry for any defect.
Record: Confrontation fields full to finger counting OD and OS
Specifically: Left homonymous superior quadrantanopia on confrontation
Defect Patterns and Their Significance
Monocular Field Loss (One Eye Only)
Lesion is anterior to the optic chiasm — in the retina or optic nerve. Causes: retinal detachment, glaucoma, CRAO, ischemic optic neuropathy, optic neuritis. Alert the doctor; may be urgent depending on acuity and onset.
Bitemporal Hemianopia
Loss of both temporal fields simultaneously. Lesion is AT the optic chiasm. Most common cause: pituitary adenoma (compresses crossing nasal fibers from below). Also: craniopharyngioma, meningioma, aneurysm. Requires urgent neuroimaging.
Homonymous Hemianopia
Loss of the same half of the visual field in both eyes (right half in both = right homonymous hemianopia). Lesion is POSTERIOR to the chiasm in the left hemisphere. Most common cause: stroke. Requires neuroimaging. If new onset with other neurological symptoms: call 911.
Homonymous Quadrantanopia
Loss of one quadrant in both eyes (same quadrant). Superior: Meyer's loop lesion in temporal lobe ("pie in the sky"). Inferior: parietal lobe lesion ("pie on the floor"). Requires neuroimaging; may indicate brain tumor, trauma, or prior stroke.
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When to Escalate Urgently
Any ACUTE new visual field loss with: headache, confusion, facial drooping, arm/leg weakness, or speech difficulty → Call 911. Acute stroke is time-critical. For non-emergency new field defects: alert the doctor immediately before proceeding with the exam. Do not downplay confrontation field findings as "probably just needs better testing." Confirm with the doctor whether to proceed with automated perimetry immediately or arrange urgent referral.