pupil constriction in response to 2.5 per cent methacholine -- indicative of parasympathetic denervation hypersensitivity -- was significantly increased in pdr ( p less than 0.001 ) , whilst pupil dilation in response to 0.5 per cent phenylephrine -- indicative of sympathetic denervation hypersensitivity -- was also significantly higher in pdr ( p less than 0.001 ) .
C0026961
pupil dilation
C0031469
phenylephrine