nomenon. The method used was to examine the magnitude and time-course of the reflex vasoconstriction in the hand which follows application of ice to the neck. One hand of each subject was kept at 260C and the other at 360C, while the general thermal environment was varied. Enhancement was found in three groups of subjects: those with idiopathic, early age-onset, Raynaud's disease; those with Ra...

AIMS To determine whether unilateral cataract causes a pathological Pulfrich's phenomenon. METHODS 29 subjects with unilateral cataract and contralateral pseudophakia were assessed on their ability to perceive the Pulfrich phenomenon. Using a computer generated pendulum image, and graded neutral density filters, a series of forced choice trials were performed in which the subject was required...