A visual field defect refers to a loss of vision in a specific area of the visual field, which can affect one or both eyes. This condition can result from various causes, including damage to the optic nerve, retina, or brain. Individuals may experience blind spots or reduced vision in certain directions, impacting daily activities like reading or driving. Diagnosis typically involves a comprehensive eye examination, including a visual field test. Treatment options depend on the underlying cause and may include medications, surgery, or vision rehabilitation. Early detection is crucial for managing the condition effectively and improving quality of life.