Abstract:
PURPOSE:Photodynamic riboflavin/ultraviolet-A (UVA)-induced collagen cross-linking, which increases the biomechanical stiffness of the human cornea by about 300%, has been introduced recently as a possible treatment for progressive keratoconus. The present study was undertaken to evaluate the longterm biomechanical effects of this new cross-linking treatment as a necessary prerequisite to its clinical success. METHODS:The corneas of the left eyes of nine male rabbits were cross-linked. The contralateral eyes served as controls. After removal of the central 7 mm of the epithelium, the corneas were treated with the photosensitizer riboflavin and UVA irradiation for 30 mins with an irradiance of 3 mW/cm(2) using a 370-nm UVA double diode. Groups of three animals were killed immediately after treatment and at 3 and 8 months, respectively. Biomechanical stress-strain measurements were performed using a microcomputer-controlled biomaterial tester on 4 x 10-mm corneal strips. RESULTS:Corneal thickness in the treated rabbit cornea was 408 +/- 20 microm. A constant and significant increase in ultimate stress (of 69.7-106.0%), Young's modulus of elasticity (of 78.4-87.4%) and a decrease in ultimate strain (of 0.57-78.4%) were found over a time period of up to 8 months after cross-linking treatment. CONCLUSIONS:Riboflavin/UVA-induced collagen cross-linking leads to a longterm increase in biomechanical rigidity which remains stable over time. These data support our previous longterm clinical observations and give hope that this new treatment will halt progressive keratoconus definitively.
journal_name
Acta Ophthalmoljournal_title
Acta ophthalmologicaauthors
Wollensak G,Iomdina Edoi
10.1111/j.1755-3768.2008.01190.xsubject
Has Abstractpub_date
2009-02-01 00:00:00pages
48-51issue
1eissn
1755-375Xissn
1755-3768pii
AOS1190journal_volume
87pub_type
杂志文章abstract:PURPOSE:To explore whether the prevalence and severity of retinopathy differ in diabetes cohorts diagnosed through screening as compared with conventional health care. METHODS:A total of 257 diabetes patients, 151 detected through screening and 106 through conventional clinical care, were included. Retinopathy was eva...
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