Name of the Procedure:

Visual Field Examination (Unilateral or Bilateral)

Summary

A visual field examination is a non-invasive test that measures a person's entire scope of vision, both central and peripheral (side) vision. It helps to detect any vision loss or blind spots.

Purpose

The test is primarily used to diagnose and monitor diseases affecting the visual field, such as glaucoma, optic neuropathy, and retinal disease. The goal is to identify vision loss early and guide appropriate treatment to prevent further deterioration.

Indications

• Blurred vision
• Peripheral vision loss
• Patient history of glaucoma or other eye diseases
• Headaches with visual symptoms
• Monitoring progression of known eye conditions

Preparation

• No specific preparation is usually required.
• Patients should bring glasses or contact lenses if they normally need them for vision.
• Inform the examiner of any medications being taken.

Procedure Description

1. The patient sits in front of a dome-shaped or bowl-shaped machine.
2. One eye is tested at a time; the other eye is covered.
3. The patient is asked to focus on a central target.
4. Lights of varying intensity are flashed in different areas, and the patient presses a button when they see a light.
5. The procedure uses tools like Goldmann perimeter for a manual exam or automated machines like Humphrey Field Analyzer for a computerized test.
6. The data collected are then interpreted to identify any abnormalities.

Duration

The examination typically takes around 15 to 30 minutes.

Setting

Performed in an ophthalmologist's office or a specialized eye clinic.

Personnel

• Ophthalmologist or optometrist
• Trained technician

Risks and Complications

• Mild discomfort from having to keep the eye focused for an extended period.
• Rare instances of eye strain or headache.
• No significant risks or complications are associated with the test.

Benefits

• Early detection of eye conditions and diseases.
• Tailored treatment plans based on the specific visual field loss.
• Monitoring of disease progression and treatment efficacy.

Recovery

• No recovery time needed.
• Patients can resume normal activities immediately after the procedure.
• Follow-up appointments may be scheduled based on the results.

Alternatives

• Confrontation visual field test: Less precise, involves the doctor providing visual stimuli manually.
• Amsler grid test: Focuses on the central visual field, often used for macular degeneration detection.

Patient Experience

• The patient may feel slight fatigue from maintaining focus and pressing the button.
• Occasionally, patients might experience minor eye strain or a headache.
• Comfort is generally maintained throughout the procedure, and breaks can be taken if needed.