Overview
Perimetry, also known as visual field testing, is a diagnostic procedure that maps the full extent of your vision, including your peripheral (side) vision. While you may see clearly when looking straight ahead, this test reveals any areas of reduced sensitivity or blind spots in your visual field that you might not notice in daily life.
Visual field testing is essential for diagnosing and monitoring glaucoma, the leading cause of irreversible blindness worldwide. Glaucoma typically damages peripheral vision first, and patients often don't notice vision loss until significant damage has occurred. Regular visual field testing can detect glaucoma damage years before it affects central vision.
Beyond glaucoma, visual field testing helps diagnose and monitor neurological conditions, stroke effects, retinal diseases, and other conditions that affect the visual pathway from the eye to the brain. The test results create a detailed map of your visual function that can be compared over time to detect any changes.
What's Included
Comprehensive features and services included in this examination.
Who Should Consider This Service?
This service is ideal for the following individuals.
Age Group
- Adults over 40 (glaucoma screening)
- Seniors (annual monitoring)
- All ages with risk factors
- Those with neurological symptoms
Symptom-Based
- Bumping into objects on one side
- Difficulty with peripheral awareness
- Missing parts of words when reading
- Trouble with night driving
Medical-Based
- Glaucoma patients or suspects
- Elevated eye pressure
- Family history of glaucoma
- Neurological conditions
Lifestyle-Based
- Drivers needing field assessment
- Those on certain medications
- Patients with diabetes
- High myopia patients
What to Expect
A step-by-step guide to your appointment experience.
Test Explanation
We explain the procedure and what to expect. You'll understand that the test measures your ability to see dim lights in your peripheral vision.
Positioning
You're seated comfortably with your chin and forehead resting on supports, looking into a bowl-shaped instrument at a central fixation target.
Testing Process
Small lights of varying brightness appear at different locations. You press a button each time you see a light, while keeping your eye on the center target.
Both Eyes Tested
Each eye is tested separately with the other eye covered. The test takes about 5-10 minutes per eye depending on the testing strategy used.
Results Analysis
The computer generates a detailed map of your visual field, comparing your results to age-matched normal values and any previous tests.
Doctor Review
The optometrist reviews the results with you, explaining any areas of concern and how the findings relate to your overall eye health.
Technology & Equipment
State-of-the-art equipment used for accurate diagnosis and treatment.
Humphrey Visual Field Analyzer
The gold-standard automated perimeter used worldwide for glaucoma diagnosis and monitoring, providing highly reproducible results.
SITA Testing Strategies
Swedish Interactive Threshold Algorithm—advanced testing protocols that reduce test time while maintaining accuracy.
GPA (Guided Progression Analysis)
Software that statistically analyzes visual field changes over time to detect true progression versus normal variability.
Pattern Deviation Analysis
Statistical analysis that separates localized visual field defects from overall sensitivity changes, improving diagnostic accuracy.
Frequently Asked Questions
Common questions about this service answered.
Why Choose Nakpil Eye Clinic?
Experienced Team
15+ years of expertise in eye care
Advanced Technology
State-of-the-art diagnostic equipment
Personalized Care
Tailored treatment plans for each patient
Comprehensive Services
Full range of eye care solutions