“…Visual dysfunction without organic cause has been described as 'psychogenic visual disturbance' (Freud,191 O), 'hysterical blindness' (Wolff and Lachman, 1938), 'hysterical amblyopia' (Yasuna, 1963), 'ocular conversion reaction' (Krill and Newell, 1968), 'visual conversion reaction' (Rada, Meyer and Kellner, 1978), 'psychogenic amblyopia' (van Balen and Slijper, 1978) and 'amblyopic schoolgirl syndrome' (Mantyjarvi,198 1 ).…”