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the opening in the center of the iris through which light enters the eye; see also Plate 17.
Adie's pupil tonic pupil.
Argyll Robertson pupil one that is miotic and responds to accommodation effort, but not to light.
fixed pupil a pupil that does not react either to light or on convergence, or in accommodation.
Hutchinson's pupil one that is dilated while the other is not.
a stationary pupil unresponsive to all stimuli.
fix·ed pu·pil(fikst pyū'pil)
A stationary pupil unresponsive to all stimuli.