The corneal limbus (Latin: corneal border) is the border between the
cornea and the
sclera (the white of the
eye). It contains
limbal stem cells in its palisades of Vogt. It may be affected by
cancer or
aniridia (a developmental problem), among other issues. The
PS , RV ring is a visible dark ring around the
iris of the eye composed of darkened areas of the corneal limbus.
The corneal limbus contains radially-oriented fibrovascular ridges known as the palisades of Vogt that contain
limbal stem cells.[1][3] The palisades of Vogt are more common in the superior and inferior quadrants around the eye.[4]
The corneal limbus may be cut to allow for
aqueous humour to drain from the
anterior chamber of the
eye into the subconjunctival space.[5] This can be used in
glaucoma treatment.[5] The hole created only needs to be small, although slightly bigger than needed to account for gradual healing.[5] This procedure sometimes fails, particularly if the hole is large.[5] It can lead to
eye irritation from
blebbing.[5]
Trabeculectomy, a surgery used to treat glaucoma, is best performed with an
incision through the superior part of the corneal limbus.[6] Mattress suturing may be used to close this incision.[6]
History
The word "limbus" comes from the
Latin meaning "border".[7]
References
^
abcDogru, Murat; Chen, Min; Shimmura, Shigeto; Tsubota, Kazuo (2009-01-01), Brightbill, Frederick S.; McDonnell, Peter J.; Farjo, Ayad A.; McGhee, Charles N. J. (eds.),
"Chapter 4 - Corneal epithelium and stem cells", Corneal Surgery (Fourth Edition), Edinburgh: Mosby, pp. 25–31,
ISBN978-0-323-04835-4, retrieved 2021-09-27
^
abcdeStamper, Robert L; Lieberman, Marc F; Drake, Michael V (2009-01-01), Stamper, Robert L; Lieberman, Marc F; Drake, Michael V (eds.),
"CHAPTER 34 - Glaucoma outflow procedures", Becker-Shaffer's Diagnosis and Therapy of the Glaucomas (Eighth Edition), Edinburgh: Mosby, pp. 466–490,
ISBN978-0-323-02394-8, retrieved 2021-09-27