Hemianopsia

Loss of vision in one half of the visual field in one or both eyes, typically caused by damage to the brain's visual pathways rather than the eyes themselves. The most common form is homonymous hemianopsia, where the same half of the visual field is lost in both eyes — for example, neither eye can see objects to the right. Hemianopsia commonly results from stroke, traumatic brain injury, or other neurological conditions and frequently co-occurs with cerebral visual impairment. For accessibility, hemianopsia means that visual information, navigation cues, or interface elements placed in the affected visual field may be completely missed, requiring careful consideration of content placement, directional indicators, and user-configurable layouts.