Computerized Visual Field Analysis (VFA): Mapping Your Peripheral Vision
Why it matters: It is the only way to measure how your optic nerve communicates with your brain. VFA detects "blind spots" that your brain naturally hides, which is vital for Glaucoma Management and meeting legal driving vision standards.
The Experience:
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Simple: You look at a central target and click a button when you see a light blink.
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Efficient: Takes between 3 to 6 minutes per eye.
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Informative: Maps your side vision to ensure your "visual field" is complete.
Video: What to Expect During Your VFA
Learn how our specialists use VFA to map your central and side vision.
At SpecSMART Eye Clinic, we utilize Computerized Visual Field Analysis (VFA) to provide a comprehensive map of your vision. While a standard eye chart measures your central vision, VFA is the gold standard for assessing your "side" or peripheral vision.
The Science of "Hidden" Blind Spots
The brain is remarkably good at "filling in" gaps in our vision. Many serious conditions, such as Glaucoma or certain Neurological issues, cause vision loss in the periphery first. Because these blind spots are outside your direct line of sight, you may not notice them until the damage is significant.
VFA allows our clinical leads, such as Dr. Adamma and Dr. Itua, to pinpoint these gaps with mathematical precision.
Clinical Excellence: Vital for Glaucoma & Safety
- Glaucoma Management: VFA is the primary tool used to track whether Glaucoma is progressing or if treatment is successfully preserving your sight.
- Neurological Health: It can detect vision changes related to strokes, tumors, or other conditions affecting the optic nerve's path to the brain.
- Driving Standards: We use these results to verify you meet the legal visual field requirements for a driver's license in Nigeria.
Preparing for Your Test
Your cooperation is key to obtaining reliable results. During the test:
- You will focus on a central target (usually a steady light or green cross).
- Flashes of light will appear briefly in random locations with varying brightness.
- Crucial Tip: Do not move your eyes to "search" for the flashes; keep your gaze fixed on the center and click the button only when you see a light in your periphery.
Frequently Asked Questions
A visual field test (also known as perimetry) is a diagnostic tool that maps out your entire field of vision. While standard eye charts measure how well you see straight ahead (central vision), this test measures your peripheral (side) vision to identify any blind spots or areas of reduced sensitivity.
We use this test to monitor the health of your optic nerve and neurological pathways. It is most commonly used to detect and manage glaucoma, a condition that slowly steals peripheral vision. It is also highly effective in identifying visual field defects caused by strokes, brain tumors, pituitary gland issues, or other neurological conditions.
Not at all. The test is entirely painless and non-invasive. Nothing will touch your eye, and no dilating drops are required for this specific procedure.
You will be seated comfortably in a darkened room and asked to look into a bowl-shaped machine. You will focus your eyes on a central target light straight ahead. Throughout the test, small flashes of light will appear in your peripheral vision at varying brightness levels. Whenever you see a light, you simply press a handheld button.
The test generally takes about 5 to 10 minutes per eye. We test each eye individually, so one eye will be temporarily covered with a patch while the other is being evaluated.
Don't worry if you blink—the machine is designed to accommodate natural eye movements. It is completely normal not to see every single light; in fact, the machine intentionally flashes lights at varying intensities to find the exact threshold of what you can and cannot see. Just relax and click the button whenever you are confident you saw a flash.
Yes, you should bring your current prescription eyewear to your appointment. Our technicians will let you know whether you need to wear them during the test, as the machine often requires your specific reading or distance prescription to get the most accurate results.
The machine generates a detailed digital map of your visual field immediately after the test is completed. Your optometrist will review the results with you during your consultation to discuss your eye health and any necessary next steps.