Simple device for measuring pupil size, first of its kind, designed by Dr Gilston. This one was made for the First World Congress on Intensive Care, London 1974, which Gilston initiated and organised. The First World Congress records are held now by the Intensive Care Society, Tavistock House, Tavistock Sq, WC1. For use in cardio-respiratory resuscitation and coma assessment. Made 1974.