PERIMETRY

Perimetry is a computerized visual field testing service that measures how well you see across your full field of vision. It maps central and peripheral sight and detects areas of reduced sensitivity. As a result, your ophthalmologist can identify functional vision loss that may not appear on routine eye charts.

WHAT THIS SERVICE MEASURES

This test evaluates how your retina and optic nerve respond to light stimuli in different visual field locations. During the exam, small lights appear in various positions, and you press a button when you see them. Therefore, the system builds a sensitivity map of your visual field. Doctors use this map to detect patterns linked to glaucoma, neurologic disease, and retinal disorders.

WHEN DOCTORS RECOMMEND PERIMETRY

Perimetry plays a key role in both diagnosis and long-term monitoring. For example, it supports early detection and progression tracking.

1. Glaucoma screening and follow-up
2. Optic nerve disease evaluation
3. Neuro-ophthalmic assessment
4. Retinal disease monitoring
5. Medication toxicity screening
6. Unexplained vision complaints

HOW THE TEST IS PERFORMED

The test is non-invasive and clinic-based. First, you sit in front of a dome-shaped instrument and focus on a central target. Next, one eye is tested at a time while the other is covered. Then, light spots appear briefly in different areas. You press a response button each time you see a light. Consequently, the device calculates your field sensitivity.

Most tests take several minutes per eye. Good concentration improves accuracy, so short rest pauses may be provided.

PATIENT EXPERIENCE AND SAFETY

Perimetry uses safe light signals and requires no contact with the eye. Because no drops or injections are needed, discomfort is minimal. However, the test requires attention and cooperation. Some patients feel temporary fatigue, yet most complete the exam without difficulty.

WHY VISUAL FIELD TESTING MATTERS

Visual field loss often develops quietly. For instance, glaucoma can reduce peripheral vision before central vision changes. Therefore, perimetry detects functional damage early. Repeated testing also shows whether disease stays stable or progresses. As a result, treatment plans can be adjusted promptly and more precisely.