Confrontation Visual Fields for the CPOA Exam

What Is Confrontation Visual Field Testing?

Confrontation visual field testing is a rapid, low-technology screening method for gross visual field defects. It is performed face-to-face between the examiner and the patient, using the examiner's own visual field as a reference. While less sensitive than formal automated perimetry, confrontation testing is fast, requires no equipment, and can detect significant field loss from neurological disease, glaucoma, or retinal pathology.

As a CPOA, you may be asked to perform confrontation visual field testing as part of the preliminary examination, or to assist in documentation when the doctor performs it.

Basic Technique

Setup

• Seat the patient directly facing you at arm's length (approximately 60 cm / 2 feet).
• Test each eye separately. Occlude the eye not being tested with an occluder or the patient's own palm (instruct them not to press on the eye).
• You occlude your opposite eye -- if testing the patient's right eye, cover your own left eye. This ensures your fields mirror the patient's.
• The patient maintains fixation on your open eye (nose bridge can also be used as a fixation target).

Finger Counting Method

The most common confrontation technique:

1. Hold your hand(s) in the patient's peripheral visual field -- typically in each of four quadrants (superior temporal, inferior temporal, superior nasal, inferior nasal).
2. Present 1, 2, or 5 fingers and ask the patient to call out the number they see without moving their eyes from fixation.
3. Test each quadrant separately and bilaterally.
4. A normal result: the patient correctly identifies fingers in all four quadrants of both eyes.

Finger Wiggle (Kinetic) Method

Move a wiggling finger from the periphery toward center in each quadrant, asking the patient to report when they first see the motion. More sensitive for detecting peripheral field loss than static finger counting.

Red Desaturation

Present a red target (a red bottle cap or red-tipped pen) in each visual field half. Ask the patient whether the color looks equally red on both sides. Loss of red color brightness on one side suggests optic nerve disease affecting that hemifield. This method is particularly useful for detecting subtle central and paracentral defects not found by finger counting.

💡 Clinical Tip: Confrontation is a screening test, not a diagnostic one. A patient who passes confrontation can still have early glaucomatous field loss or subtle neurological defects. Patients who fail confrontation, however, almost certainly have significant disease and need formal perimetry promptly.

Documenting Findings

Document confrontation visual field results in the patient record using standard notation:

• Normal: "CVF full to finger counting OU" or "FTFC OU"
• Defect found: Describe which eye, which quadrant(s), and the method used. Example: "CVF: defect inferior temporal quadrant OD to finger counting."
• Draw a schematic if a defect is found, marking the affected quadrant on a visual field diagram.

Common Field Defects and Their Significance

⚠️ Common Mistake: Testing both of the patient's eyes simultaneously without proper monocular occlusion. Many visual field defects are monocular -- if both eyes are open, the other eye compensates and the defect is missed entirely. Always occlude one eye during confrontation testing.

Key Takeaways

• Confrontation visual field testing is a quick, equipment-free screen for gross visual field defects.
• Test each eye separately with the fellow eye properly occluded.
• Common techniques: finger counting (4 quadrants), kinetic finger wiggling, and red desaturation.
• Document results as full to finger counting (normal) or describe the quadrant and eye affected (defect).
• Hemianopia suggests a lesion at or behind the chiasm; monocular loss suggests pre-chiasmal disease.
• Confrontation is a screen only -- a normal result does not exclude subtle visual field loss.