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pupil

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pupil

1
1. a student who is taught by a teacher, esp a young student
2. Civil and Scots law a boy under 14 or a girl under 12 who is in the care of a guardian

pupil

2
the dark circular aperture at the centre of the iris of the eye, through which light enters
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

pupil

[′pyü·pəl]
(anatomy)
The contractile opening in the iris of the vertebrate eye.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pupil

 

the opening in the iris through which light rays enter the eye.

The dimensions of the pupil change according to the amount of light present: the pupil dilates in darkness, under emotional excitement and painful sensations, or with the injection of atropine or adrenalin into the body; it contracts in bright light. Change in the dimensions of the pupil is regulated by fibers of the autonomic nervous system and is accomplished by means of two smooth muscles located in the iris—the sphincter, which contracts the pupil, and the dilator, which expands it. In higher vertebrates, changes in the dimensions of the pupil are produced reflexively by the effect of light on the retina of the eye; in lower vertebrates, these changes are produced by the direct action of light on contrac-tile formations in the pupil. The pupil is usually round or slitlike; in some fish (for example, in a number of sharks, rays, and flounder) and mammals (for example, in sperm whales and dolphins) a projection of the iris, suspended from the superior edge of the pupil, can cover the pupil completely in the presence of intense illumination. In man the pupil is round; its diameter may change from 1.1 mm to 8 mm. Changes in the shape, dimensions, and speed of reaction of the pupil (so-called pupillary reflexes) are of diagnostic significance in eye diseases.

O. G. STROEVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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(42) One now in Cologne city library, having a Paris edition of the Pupilla oculi bound with it, belonged to the charterhouse there, besides two more in a later catalogue.
The Speculum Spiritualium from Manuscript to Print
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Ameliyat asamasinda hicbir olguda pupilla dilatasyonu amaciyla iris retraksiyon hooklari uygulamasi gibi pupillaya yonelik bir islem yapilmadi.
Bir olguda on kamarada 1-2 mm hipopiyon mevcuttu ve ayni olguda pupilla alanini kaplayan membran gozlendi.
Toxic anterior segment syndrome related to viscoelastic substance/Viskoelastik maddeye bagli gelisen Toksik Anterior Segment Sendromu
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Cataract surgery in eyes with shallow anterior chamber/On kamara yoklugu veya sigliginda katarakt cerrahisi
On segment muayenesinde bilateral diffuz konjonktival hiperemi, korneal odem, sig on kamara, pupillalar dilate ve pupilla reaksiyonlari negatif olarak saptandi.
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Nd YAG lazer posterior kapsulotomiden 30 dakika once tum gozlerde, tropikamid %1'lik damla kullanilarak, pupilla dilatasyonu saglandi.
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The retinal nerve fiber layer thickness changes evaluated by optical coherence tomography after phacoemulsification surgery/Optik koherens tomografi ile degerlendirilen retina sinir lifi kalinliginin fakoemulsifikasyon cerrahisi sonrasi degisimi
Bir optik sistem pupilla santralinde refraktif kusur barindirmazken pupil merkezini cevreleyen dairesel zonlarda kusur artabilir.
Optical aberrations and wavefront/Optik aberasyonlar ve wavefront
Direkt ve indirekt pupilla reaksiyonlari normal olarak izlendi.
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(1) PES'in merkezi zonu genellikle pupilla capina esittir.
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Tum goruntuler ayni hekim tarafindan %1 tropikamid ile pupilla dilatasyonu saglandiktan sonra alindi.
Optic nerve head and retinal nerve fiber layer analysis in ocular hypertension and early-stage glucoma using spectral-domain optical coherence tomography copernicus/Okuler hipertansiyon ve erken evre glokomda spektral- domain optik koherens tomograficopernicus ile optik sinir basi ve retinal sinir lifi analizi
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