näkökenttätestaus

Näkökenttätestaus, also known as visual field testing, is a medical examination used to assess a person's peripheral vision. It helps detect and monitor vision loss that may occur in the outer edges of a person's visual field, which can be a symptom of various eye conditions and neurological disorders.

The test is typically performed by a technician or ophthalmologist using a specialized instrument called a perimeter. There are several types of perimetry, but the most common involves a patient looking into a bowl-shaped screen or a darkened room. The patient is asked to fixate on a central point while small lights or targets are presented at various locations within their field of vision. The patient indicates when they see a light, often by pressing a button.

The results of the näkökenttätestaus are recorded on a chart that maps the extent of the patient's visual field. Areas where the patient failed to detect the light indicate a loss of vision. This information is crucial for diagnosing conditions such as glaucoma, macular degeneration, optic nerve damage, and brain injuries that can affect the visual pathways. Regular visual field testing can help track the progression of these diseases and evaluate the effectiveness of treatment. The test is generally painless and non-invasive, though it can be tiring for some individuals.