Scotoma (scoe-TOE-muh)- an area in the visual field that can’t be seen, usually due to central damage by stroke or other brain injury.
Blindsight- an abnormal condition in which parts of the visual field are not consciously perceived but can be subconsciously perceived by extrastriate
cortex.
Visualagnosia (ag-NOSEee-uh) - a disorder in which a person can see a stimulus but cannot identify what is seen.
Prosopagnosia (pro-soh-pagNOH-see-uh) - the inability to recognize known
faces.