How do you perform confrontation visual field testing?

Sit facing the patient about 1 meter away. Test one eye at a time: the patient covers one eye, you cover the opposite eye, and both of you fixate on each other's open eye. Present a target (finger or white pin) in each of the four quadrants from the periphery inward, asking the patient to say when they see it. Compare to when you first see the target to detect relative differences. Repeat for the other eye.

What does a bitemporal hemianopia indicate?

Bitemporal hemianopia is loss of the temporal (outer) visual field in both eyes simultaneously. It results from a lesion at the optic chiasm, where the nasal fibers from each eye cross. The most common cause is a pituitary adenoma compressing the chiasm from below. This pattern is a red flag requiring urgent neurological imaging.

What are the limitations of confrontation visual field testing?

Confrontation testing detects only moderate to severe field defects. It is subjective, qualitative, and depends on examiner skill and patient cooperation. Subtle losses, early glaucomatous defects, and small scotomas will not be detected. A normal confrontation test does not rule out visual field pathology. Automated perimetry (Humphrey visual fields) is required for sensitive, quantitative field assessment.

Confrontation Visual Fields: CPO Exam Guide

What Is Confrontation Visual Field Testing?

Confrontation visual field testing is a quick, chair-side screening method for detecting gross visual field defects. It requires no special equipment, takes only 1-2 minutes per patient, and can identify significant field losses from neurological or retinal conditions. As a CPO, you may perform confrontation testing as part of the pre-exam workup.

Basic Technique

The standard confrontation test compares the patient's visual field to the examiner's, assuming the examiner has a normal field:

Sit or stand approximately 3 feet (1 meter) directly in front of the patient
Ask the patient to cover the left eye; you cover your right eye
Both of you look directly at each other's uncovered eye (patient's right, examiner's left)
Hold a target (finger, wiggling finger, or white-tipped pin) in the periphery midway between you
Move the target from the periphery inward and ask the patient to say when they first see it
Compare the patient's response to when you (as a normal reference) first see the target
Test all four quadrants: superior, inferior, nasal, and temporal
Repeat for the other eye

Always test one eye at a time and have the patient fixate on a specific point (your nose or eye). Moving fixation introduces error. The goal is to detect gross field defects, not to precisely quantify them — that requires formal perimetry.

Finger Counting Method

An alternative to target presentation is presenting fingers simultaneously in two quadrants and asking the patient how many fingers they see. Patients with a field defect in one quadrant will not perceive the fingers on that side, or will miscount.

Common Field Defect Patterns and Their Significance

Defect Pattern	Location	Common Cause
Monocular loss	One eye only	Retinal disease, optic nerve lesion anterior to chiasm
Bitemporal hemianopia	Temporal fields of both eyes	Pituitary tumor compressing the optic chiasm
Homonymous hemianopia	Same side in both eyes	Stroke affecting the optic tract or occipital cortex
Altitudinal defect	Upper or lower half of field	AION (ischemic optic neuropathy), branch retinal artery occlusion
Central scotoma	Central field only	Macular disease, optic neuritis

If a patient describes not seeing a finger in the temporal field of one eye and the nasal field of the other eye (a bitemporal pattern), this is a red flag for a lesion at or near the optic chiasm, commonly a pituitary adenoma. This finding requires urgent neurological investigation.

Limitations

Confrontation testing is a screening tool, not a definitive perimetric evaluation:

Detects only moderate to severe field defects; subtle losses are missed
Results are qualitative and subjective, depending on patient cooperation and examiner skill
Cannot quantify defect depth or map precise boundaries
A normal confrontation field does not exclude subtle or early glaucomatous field loss

Concluding the visual fields are normal based on a normal confrontation test. Confrontation visual fields are a gross screening tool. Early glaucoma, subtle neurological field defects, and small scotomas require automated perimetry (Humphrey visual field) for detection.

Key Takeaways

Confrontation fields are a bedside screening test requiring no equipment
Test each eye separately while the patient fixates on a central point
Bitemporal hemianopia suggests chiasmal compression (pituitary tumor)
Homonymous hemianopia suggests post-chiasmal lesion (stroke, tumor)
Normal confrontation does not exclude subtle field defects; formal perimetry is needed for sensitive detection