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===Microanatomy=== [[File:Auge Iris.jpg|thumb|Light micrograph of the iris near to the pupil. ''M. sph.'' sphincter muscle, ''L'' lens]] [[File:Doppler holography of Olivier Martinache's myosis.gif|thumb|Constriction of the pupil ([[miosis]]) observed by [[laser Doppler imaging]] reveals radial vessels of the iris.]] [[File:Voluntary pupil dilation.gif|thumb|A human eye demonstrating its owner's rare ability to voluntarily dilate and constrict his pupil on command, via voluntary control of his iris muscles.]] [[File:SD OCT - Anterior Chamber Angle Cross-Section (with viewfinder).png|thumb|Anterior chamber cross-section imaged by an [[SD-OCT]].]] From anterior (front) to posterior (back), the layers of the iris are: *Anterior limiting layer *[[Stroma of iris]] *[[Iris sphincter muscle]] *[[Iris dilator muscle]] (myoepithelium) *Anterior pigment epithelium *Posterior pigment epithelium
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