Willingly prevented from knowing certain information that, were it known, might bias an outcome or decision (either consciously or unconsciously).
Covered by blinds.
Deprived of sight temporarily, by being either dazzled or blindfolded.
Displaying a particular destination or route number on the blinds.
Lacking intellectual discernment, as for example because of greed or stupidity.
Deprived of sight in a way that is or may be permanent, by damage to the eyes or brain.