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iris of the eye (orris, I)

Structure: - the anterior division of the vascular covering of the eye - in its center in the pupil; at its periphery is the sclera - it is composed of stroma & a double layer of pigmented retinal epithelium from which are derived the sphincter pupillae & dilator pupillae muscles of the pupil - the iris collarette is a landmark that separates the central pupillary zone from the peripheral ciliary zone - it is typically flat but can be prominent, a normal variant that requires no treatment [2] (image)

Related

immune reconstitution inflammatory syndrome (IRIS)

General

eye structure

References

  1. Stedman's Medical Dictionary 26th ed, Williams & Wilkins, Baltimore, 1995
  2. Li S, Liang L. (image) Protruding Iris Collarette. N Engl J Med 2017; 376:1064. March 16, 2017 PMID: 28296615 http://www.nejm.org/doi/full/10.1056/NEJMicm1516330
  3. Wikipedia: Iris (anatomy) https://en.wikipedia.org/wiki/Iris_(anatomy)

Images

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