Agoraphobia

Agoraphobia was a psychological condition. The sufferer was afraid of open spaces and the outside, sometimes to the point where he could not leave his own home. According to Bernice Summerfield, one girl suffering from the condition committed suicide within 24 hours of getting locked in the Glass Prison — she "couldn't bear the lack of comforting non-see-through walls". (PROSE: The Glass Prison)

Alistair Gryffen began suffering from agoraphobia after he lost his wife and children. (TV: The Fall of the House of Gryffen) He finally overcame his fear to shut down the Space-Time Manipulator. (TV: The Eclipse of the Korven)