Visual Field Test

A visual field test evaluates how well you can see objects in your peripheral vision, also known as side vision. While central vision allows you to focus on objects directly in front of you, peripheral vision helps you detect movement and objects around you without moving your eyes.

At Eyesight.sg, our optometrists perform visual field tests in Singapore to assess the full range of your vision and detect potential changes that may indicate eye or neurological conditions. Visual field testing is commonly used to monitor glaucoma, evaluate optic nerve health, and identify blind spots that may not be noticeable in daily life.

What Is a Visual Field Test?

A visual field test is a specialised eye examination used to measure the full horizontal and vertical range of vision. The test identifies areas where vision may be reduced or missing, often referred to as blind spots.

Visual field testing is commonly used in ophthalmology to detect early changes in peripheral vision that may be associated with certain eye conditions.

A visual field exam may help assess:

• Peripheral vision function
• Blind spots in the visual field
• Optic nerve health
• Vision changes caused by glaucoma
• Possible neurological visual field defects

The results of a visual field test provide a detailed map of how well a person can see across their entire field of vision.

How Visual Field Testing Works?

During visual field testing, the patient focuses on a fixed point while lights or visual targets appear in different areas of the visual field. Each time the patient detects a target, they respond by pressing a button.

The system records the responses and generates a map that shows which areas of the visual field are seen clearly and which areas may have reduced sensitivity.

This process allows eye care professionals to identify subtle vision changes that may not be noticeable during routine visual activities.

Who May Need a Visual Field Exam?

A visual field exam may be recommended in several situations where peripheral vision needs to be evaluated.

Patients with Glaucoma

Visual field testing is commonly used to monitor glaucoma because the condition can gradually affect peripheral vision before central vision is affected.

Individuals with Optic Nerve Conditions

Damage or pressure affecting the optic nerve may lead to changes in the visual field. Testing helps detect these changes early.

Patients with Unexplained Vision Changes

People experiencing difficulty seeing objects to the side or noticing missing areas in their vision may be advised to undergo visual field testing.

Neurological Assessments

In some cases, visual field tests may help identify visual changes related to neurological conditions affecting the brain or optic pathways.

The Visual Field Test Procedure

A visual field test is simple and non-invasive, and it usually takes around 10 to 20 minutes per eye.

Step 1: Test Preparation

The patient sits comfortably in front of a specialised testing device and places their chin on a support to keep the head steady.

Step 2: Focus on the Central Target

The patient looks at a fixed point in the centre of the testing screen throughout the examination.

Step 3: Detecting Light Targets

Small lights appear in different areas of the visual field. Each time the patient sees a light, they press a response button.

Step 4: Visual Field Mapping

The device records the responses and creates a detailed map showing how sensitive different parts of the visual field are.

The test is painless and does not involve any contact with the eye.

Understanding Visual Field Test Results

The results of a visual field exam show how well a person can detect visual stimuli in different parts of their field of vision.

If certain areas show reduced sensitivity, it may indicate possible vision loss in those regions. Eye care professionals analyse these patterns to determine whether they may be related to glaucoma, optic nerve damage, or other conditions.

Repeated visual field tests may be performed over time to monitor whether any changes occur.

Visual Field Test Side Effects

Visual field testing is considered a safe and non invasive diagnostic procedure. Most patients experience no side effects.

In some cases, individuals may experience mild eye fatigue or concentration fatigue because the test requires sustained focus.

These effects are usually temporary and resolve shortly after the test is completed.

Virtual Visual Field Testing

Some modern clinics use advanced technology known as virtual visual field testing. This approach uses digital systems to perform visual field assessments with improved accuracy and patient comfort.

Virtual visual field systems may help provide more flexible testing options while still delivering reliable measurements of peripheral vision.

Frequently Asked Questions About Visual Field Tests in Singapore

Q: What is a visual field test?

A: A visual field test is an eye examination that measures how well a person can see objects in their peripheral vision while focusing on a central point.

Q: Why is visual field testing important?

A: Visual field testing helps detect early vision changes associated with conditions such as glaucoma or optic nerve damage.

Q: How long does a visual field exam take?

A: A visual field exam usually takes around 10 to 20 minutes per eye, depending on the testing method used.

Q: Are there any visual field test side effects?

A: Most patients do not experience side effects. Some individuals may feel mild eye fatigue or concentration fatigue during the test.

Q: When should I get a visual field test?

A: Eye care professionals may recommend visual field testing if you have glaucoma, optic nerve conditions, unexplained vision changes, or if monitoring of peripheral vision is required.

Assess Your Peripheral Vision With a Visual Field Test

A visual field test in Singapore helps evaluate the full range of your vision and detect early changes that may affect peripheral sight.

At Eyesight.sg, our optometrists perform comprehensive eye examinations and visual field testing to help patients understand their visual health and detect potential issues early.