Visual field loss refers to a reduction in the area that a person can see, which can affect one or both eyes. This condition can result from various causes, including glaucoma, retinal detachment, or stroke. Individuals may experience blind spots or a narrowing of their peripheral vision, making it challenging to detect objects outside their direct line of sight. Diagnosis typically involves a comprehensive eye examination, including tests like perimetry, which measures the visual field. Treatment options depend on the underlying cause and may include medications, surgery, or vision rehabilitation to help individuals adapt to their visual changes.