Visual field

Visual Field Test: What It Is & Why It’s Important

A Visual Field Test is a critical part of eye care and is used to evaluate a patient’s peripheral vision, or their side vision. This type of testing helps determine the possibility of diseases and issues related to one’s vision. It can serve as an early detection method for conditions like glaucoma, as well as other neurological diseases, such as a brain tumor. It is an important tool for diagnosing and treating problems in the eye.

Preparation For Visual Field Testing

For accurate results, it’s important to do some preparation before undergoing a Visual Field Test. Wearing the appropriate prescription glasses for the test is essential; contact lenses should not be worn. Patients should avoid wearing any makeup, hats, or other items that might block or obscure their vision. The environment in which the test is conducted is also important; there should be ample light, the room should be at a comfortable temperature, and there should be minimal distraction.

The Visual Field Test Procedure

This procedure involves sitting in front of a machine and looking into a bowl-like dome. The patient’s head should remain still and eyes should be focused on the middle of the dome throughout the duration of the test. An instrument called a perimetry, which is a kind of lighted wand, is then used to measure eye responses. The light will move across the field of view and the patient will be asked to press a button or indicate in some way when they can see the lights. The light will be at various levels of brightness and its movements will be both static and dynamic. Depending on the results of the Visual Field Test, no further action may be needed or further testing may be advised.

Types Of Visual Field Testing

Two of the most common types of Visual Field Tests are automated and static perimetry. Automated perimetry offers higher reliability and accuracy, making it the preferred choice for detecting disease. This type of testing uses a computer to measure results. Static perimetry uses a manual light projector and is more time-consuming; however, it is typically less expensive and is well-suited for screening tests.

Risks And Side Effects Of Visual Field Tests

Visual Field Tests are generally considered to be safe procedures and have very few risks associated with them. The primary side effect is eye fatigue; as the test requires one to remain stationary for a period of time, the eye muscles can become fatigued and sore.

When To Consider Visual Field Tests

Visual Field Tests may be recommended as a regular part of eye care for those over the age of 50, or may be recommended for those at a higher risk of eye conditions such as glaucoma. A thorough eye exam should include a Visual Field Test, as it can detect conditions early on, helping to ensure the best possible outcome. Scheduling regular testing can help to ensure healthy vision into the future.