Can we measure corneal biomechanical changes after collagen cross-linking in eyes with keratoconus?--a pilot study.

Abstract:

PURPOSE:To assess changes in biomechanical properties of human cornea after treatment of keratoconus with UV-A-riboflavin corneal collagen cross-linking (CXL). DESIGN:Single-center, prospective, interventional study. METHODS:Ten eyes of 10 patients aged 26.5 +/- 5.7 (mean +/- SD) years with progressive keratoconus were treated with UV-A-riboflavin CXL and assessed with the Ocular Response Analyzer (ORA) that measured corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg), and corneal compensated intraocular pressure (IOPcc). Intraocular pressure was also measured by Goldmann applanation tonometry (GAT-IOP). Patients were assessed with ORA preoperatively, at week 1, months 1, 3, and 6 after treatment. Postoperative measurements at each visit were compared with preoperative values. RESULTS:CH and CRF were transiently elevated after cross-linking treatment, with the difference not statistically significant (P > 0.3). IOPcc and IOPg were statistically significantly higher at 1 week and 1 month but not subsequently (P < 0.04). GAT-IOP was statistically significantly higher at 1 week and at 1 and 3 months (P < 0.01). CONCLUSIONS:There were no significant differences in corneal biomechanical properties, as measured with the ORA parameters CH and CRF, after CXL in keratoconus. IOPcc, IOPg, and GAT-IOP values were transiently elevated after CXL treatment in our study. Whether this reflects a measurement artifact resulting from corneal changes or true elevation of intraocular pressure is unclear.

journal_name

Cornea

journal_title

Cornea

authors

Goldich Y,Barkana Y,Morad Y,Hartstein M,Avni I,Zadok D

doi

10.1097/ICO.0b013e318190734d

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

498-502

issue

5

eissn

0277-3740

issn

1536-4798

journal_volume

28

pub_type

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