DOI: 10.1097/ico.0000000000003431 ISSN: 0277-3740

Bowman Layer Marking for Correct Placement of Corneal Allogenic Intrastromal Ring Segments

Soosan Jacob, Amar Agarwal, Shady Awwad, Jack Parker, Michael Mimouni, Sambath J
  • Ophthalmology


Corneal allogenic intrastromal ring segments (CAIRS) refer to the placement of allogenic rings and segments in intrastromal channels within the cornea. Currently, a deepithelialized donor cornea is used as the allogenic source for CAIRS and the cut ring is turned sideways and implanted so that the thickness can be varied by varying the distance between the concentric trephine blades. In addition, to obtain a greater effect, CAIRSs are preferred to be implanted with the Bowman layer (BL) facing the corneal apex and posterior stroma facing limbally. Being flexible tissue, it is, however, important to prevent twisting and to maintain correct orientation. We describe a simple technique of marking the BL with a gentian violet surgical marker to simplify CAIRS insertion. BL marking allows easy visibility of twists and helps identify improper orientation, thus allowing correct insertion of CAIRS.

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