Answer:
The diagnostic test that involves watching a computer monitor with alternating checkerboard patterns while an EEG is performed is known as a <em>visual evoked potential (VEP).</em>
Explanation:
What is a visual evoked potential? (VEP)
<em>A visual evoked potential: </em>A visual evoked potential is an evoked potential caused by a visual stimulus, such as an alternating checkerboard pattern on a computer screen. Responses are recorded from electrodes that are placed on the back of your head and are observed as a reading on an electroencephalogram (EEG). These responses usually originate from the occipital cortex, the area of the brain involved in receiving and interpreting visual signals.
When is the VEP used?
A doctor may recommend that you go for a VEP test when you are experiencing changes in your vision that can be due to problems along the pathways of certain nerves. Some of these symptoms may include:
- Loss of vision (this can be painful or non-painful);
- Double vision;
- Blurred vision;
- Flashing lights;
- Alterations in colour vision; or
- Weakness of the eyes, arms or legs.
These changes are often too subtle or not easily detected on clinical examination in the doctor’s surgery. In general terms, the test is useful for detecting <em>optic nerve problems. </em>This nerve helps transfer signals to allow us to see, so testing the nerve allows the doctor to see how your visual system responds to light. <em>The test is also useful because it can be used to check vision in children and adults who are unable to read eye charts.</em>
