It is often confused with , but they are distinct:
Patients may walk into walls or furniture but will offer excuses—like the room being too dark or the furniture being moved—rather than admitting they are blind.
A complete lack of insight into their own blindness; the patient denies any vision loss.
To explain away their inability to see, the brain "makes up" visual descriptions. For example, a patient might describe a doctor's tie in detail, even though they cannot see it.