Back to Journals » Clinical Ophthalmology » Volume 5

Changes in corneal biomechanics following different keratoplasty techniques

Authors Hosny M , Hassaballa M, Shalaby A

Published 9 June 2011 Volume 2011:5 Pages 767—770


Review by Single anonymous peer review

Peer reviewer comments 3

Mohamed Hosny, Mohamed Abdel Moneim Hassaballa, Ahmed Shalaby
Ophthalmology Department, Faculty of Medicine, Cairo University, Cairo, Egypt

Purpose: To evaluate corneal biomechanics with the Ocular Response Analyzer (ORA; Reichert Ophthalmic Instruments, Depew, NY) after penetrating keratoplasty (PK) and deep anterior lamellar keratoplasty (DALK).
Subjects and methods: Sixty-three eyes of 63 patients were included in this prospective comparative study. Patients were divided into 3 groups: the first included 21 eyes of normal subjects (control group); the second included 21 eyes with PK; the third included 21 eyes with DALK. ORA was performed 2 months postoperatively for all patients.
Results: Both mean corneal hysteresis (CH) and mean corneal resistance factor (CRF) were significantly lower in the PK group than both the DALK group and matched controls. No statistically significant difference was found between mean CH and mean CRF between the DALK group and matched controls
Conclusion: Corneas after PK have weaker biomechanical properties than normal corneas. DALK preserves the biomechanical strength of the corneas to almost normal values.

hysteresis, keratoplasty, keratoconus


Creative Commons License © 2011 The Author(s). This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.