tonic pupil

pupil /pu·pil/ (P) (pu´pil) the opening in the center of the iris through which light enters the eye.pu´pillary

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Adie's pupil  tonic p.

Argyll Robertson pupil  one that is miotic and responds to accommodative effort, but not to light.

fixed pupil  one 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.

tonic pupil  a usually unilateral condition of the eye in which the affected pupil is larger than the other; responds to accommodation and convergence in a slow, delayed fashion; and reacts to light only after prolonged exposure to dark or light.

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tonic pupil

n.

A usually enlarged pupil that responds very slowly to changes in focal length and exposure to light. Also called Piltz sign, Westphal-Piltz pupil.

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tonic pupil.

See Adie's pupil.

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pupil

the aperture in the center of the iris which regulates the amount of light that reaches the retina.

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Adie's pupil

dilated pupil due to parasympathetic denervation.

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.

multiple p's

polycoria.

occluded pupil

a congenital or acquired pupillary membrane that obstructs the pupil.

secluded pupil

a complete posterior synechia that separates the anterior and posterior chambers of the anterior compartment.

spastic pupil syndrome

anisocoria with pupils that fail to dilate in darkness. Seen in cats infected with feline leukemia virus. The virus has been observed in the short ciliary nerves and ciliary ganglia of some affected cats.

tonic pupil

see pupilloplegia.