Femtosecond laser top hat penetrating keratoplasty: Wound burst pressures of incomplete cuts

Penny McAllum, Igor Kaiserman, Irit Bahar, David Rootman

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Objective: To investigate the pressure required to rupture femtosecond laser top hat configuration corneal dissections with incomplete dissections. Methods: Twenty corneoscleral buttons underwent femtosecond laser top hat configuration dissections. Group A had complete dissections; group B, 100-μm gaps in the anterior side cut; group C, 50-μm gaps in the anterior side cut; group D, 100-μm gaps in the lamellar cut; and group E, 50-μm gaps in the lamellar cut. The pressure required to rupture each cornea was measured. Results: The mean (SD) pressure required to rupture the corneas was 111 (74) mm Hg for group A, 1565 (509) mm Hg for group B, 747 (209) mm Hg for group C, 550 (303) mm Hg for group D, and 392 (166) mm Hg for group E (P = .03 for all compared with group A). Conclusions: Incomplete femtosecond laser top hat dissections are highly resistant to rupture by direct pressurization. Gaps in the anterior side cuts are stronger than comparably sized gaps in the lamellar cuts. Clinical Relevance: Undertaking femtosecond laser keratoplasty in a 2-site setting should, theoretically, have a high level of safety. Burst pressures are high enough to resist an inadvertent sudden increase in intraocular pressure providing that incomplete recipient laser dissections are undertaken.

Original languageEnglish
Pages (from-to)822-825
Number of pages4
JournalArchives of Ophthalmology
Volume126
Issue number6
DOIs
StatePublished - 1 Jun 2008
Externally publishedYes

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