Answer: Conversion disorder
Explanation: Conversion disorder is the disorder that is related with the mental illness .It can cause blindness, sometimes neurological problems, paralysis etc. The symptoms of this disorder are balance loss, weakness, unresponsive moments, paralysis etc.
As per the situation mentioned about the World War II, the bomber pilots suffered from conversion disorder in which they are not able to see(blindness) at night even though optic nerve is not damaged .Thus the evaluation of this disorder is complex even through medical testing.