Intended for healthcare professionals


Chronic angle closure glaucoma with prominent iris collarettes

BMJ 2019; 366 doi: (Published 08 August 2019) Cite this as: BMJ 2019;366:l4467
  1. Wei Liu, , associate chief physician1,
  2. Shaorui Liu, attending doctor2
  1. 1Department of Ophthalmology, Affiliated Hospital Of Yangzhou University, Zhejiang, China
  2. 2Department of Ophthalmology, Shanghai Ninth People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
  1. Correspondence to S Liu grasiya{at}

This is a slit lamp photograph showing iris collarettes that protrude from the surface of the iris (fig 1, arrows).

The patient was a 42 year old man with chronic angle closure glaucoma.

Iris collarettes, also known as iris autonomic nerve loops, make up the area of the iris between the pupillary zone and the ciliary zone, and consist of blood vessels and nerves. Iris textures vary by individual, but collarettes usually lie flat on the surface of the iris.

Having protruding iris collarettes is not a risk factor for glaucoma, or any other ophthalmological condition; this is a benign incidental finding.


  • Patient consent obtained.

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