[1] Univ Bonn, Dept Psychol, Kaiser Karl Ring 9, D-53111 Bonn, Germany
[2] Univ Bonn, Dept Ophthalmol, Bonn, Germany
[3] Univ Bonn, Dept Psychiat & Psychotherapy, Bonn, Germany
[4] Univ Essex, Dept Psychol, Colchester, Essex, England
[5] Augenzentrum Grischun, Chur, Switzerland