PURPOSE: To investigate the effect of cross-linking treatment on corneal permeability in a live animal model. METHODS: Rabbit eyes were selected at random to be left unoperated or to undergo epithelial debridement with or without treatment consisting of cross-linking (CXL) with riboflavin and ultraviolet-A. Nine eyes received a total dose of 3.6 J/cm² and after epithelial healing the corneas were placed in a two-chamber system for quantification of the diffusion of fluorescein compared with controls. Thirty eyes received a total dose of 5.4 J/cm² and, after epithelial healing, in vivo corneal permeability was quantified as the pupillary response over a 30-minute period to a dose of topical pilocarpine compared with controls. RESULTS: In the ex vivo assay, the mean permeability coefficient in the CXL group (2.42 × 10⁻⁷) was reduced when compared with the unoperated controls (3.73 × 10⁻⁷; P = 0.007) and to the eyes that received epithelial debridement alone (3.74 × 10⁻⁷; P = 0.01). In the in vivo permeability assay, the change in pupillary diameter at 30 minutes after pilocarpine administration was smaller in the CXL group (-1.9 mm), compared with the epithelial debridement group (-2.6 mm; P < 0.001) and with the unoperated controls (-2.7 mm; P = 0.003). CONCLUSIONS: Corneal cross-linking with ultraviolet-A and riboflavin results in a statistically significant reduction in corneal permeability. These findings suggest that dosing of topical medications may need to be increased in eyes with a history of CXL to achieve expected therapeutic effects, and they may have implications for the long-term health of the cornea.
PURPOSE: To investigate the effect of cross-linking treatment on corneal permeability in a live animal model. METHODS:Rabbit eyes were selected at random to be left unoperated or to undergo epithelial debridement with or without treatment consisting of cross-linking (CXL) with riboflavin and ultraviolet-A. Nine eyes received a total dose of 3.6 J/cm² and after epithelial healing the corneas were placed in a two-chamber system for quantification of the diffusion of fluorescein compared with controls. Thirty eyes received a total dose of 5.4 J/cm² and, after epithelial healing, in vivo corneal permeability was quantified as the pupillary response over a 30-minute period to a dose of topical pilocarpine compared with controls. RESULTS: In the ex vivo assay, the mean permeability coefficient in the CXL group (2.42 × 10⁻⁷) was reduced when compared with the unoperated controls (3.73 × 10⁻⁷; P = 0.007) and to the eyes that received epithelial debridement alone (3.74 × 10⁻⁷; P = 0.01). In the in vivo permeability assay, the change in pupillary diameter at 30 minutes after pilocarpine administration was smaller in the CXL group (-1.9 mm), compared with the epithelial debridement group (-2.6 mm; P < 0.001) and with the unoperated controls (-2.7 mm; P = 0.003). CONCLUSIONS: Corneal cross-linking with ultraviolet-A and riboflavin results in a statistically significant reduction in corneal permeability. These findings suggest that dosing of topical medications may need to be increased in eyes with a history of CXL to achieve expected therapeutic effects, and they may have implications for the long-term health of the cornea.
Authors: Christine Wittig-Silva; Mark Whiting; Ecosse Lamoureux; Richard G Lindsay; Laurie J Sullivan; Grant R Snibson Journal: J Refract Surg Date: 2008-09 Impact factor: 3.573
Authors: A Scott McCall; Stefan Kraft; Henry F Edelhauser; George W Kidder; Richard R Lundquist; Helen E Bradshaw; Zinaida Dedeic; Megan J C Dionne; Ethan M Clement; Gary W Conrad Journal: Invest Ophthalmol Vis Sci Date: 2009-07-30 Impact factor: 4.799
Authors: Saud A Alanazi; Gamal A El-Hiti; Abdulaziz A Al-Baloud; Mohamed I Alfarhan; Ammar Al-Shahrani; Abdulkareem A Albakri; Saad Alqahtani; Ali M Masmali Journal: Clin Ophthalmol Date: 2019-04-10
Authors: Rohit Shetty; Luci Kaweri; Rudy M M A Nuijts; Harsha Nagaraja; Vishal Arora; Rajesh S Kumar Journal: Biomed Res Int Date: 2014-09-11 Impact factor: 3.411