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In a monograph of ninety pages Noyer gives the results of his investigations of a reaction described by Tournay in 1917 and 1918. This reaction consists of the production, on looking laterally, of an inequality of the pupils which is due to dilatation of the pupil of the abducted eye and appears after the eves have been carried laterally and held there for a few seconds. The inequality was shown by Noyer to be due to dilatation in the abducted eye and not to contraction of the adducted eye. The reaction is independent of the stimulus of light and can be demonstrated in a dark room by means of the light reflected from an ophthalmoscopic mirror.
Noyer examined this reaction in several thousand normal people and found it present in all of them. It is much easier to obtain in those with moderately large pupils than in those with small.
ANISOCORIA ON LOOKING LATERALLY (THE REACTION OF TOURNAY).. Arch NeurPsych. 1922;8(3):339–340. doi:10.1001/archneurpsyc.1922.02190150117008
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