Change in corneal microstructure with rigid gas permeable contact lens use following collagen cross-linking: an in vivo confocal microscopy study. Issue 4 (24th December 2013)

• Record Type: Journal Article
• Authors: Sehra, Sri V; Titiyal, Jeewan S; Sharma, Namrata; Tandon, Radhika; Sinha, Rajesh
• Is Part Of: British journal of ophthalmology. Volume 98:Issue 4(2014)
• Page Start: 442
• Page End: 447
• Publication Date: 2013-12-24
• Subjects: Cornea -- Contact lens; Ophthalmology -- Periodicals; 617.7
• DOI: 10.1136/bjophthalmol-2013-303934
• Languages: English
• ISSNs: 0007-1161

Abstract

Abstract : Aim: To study corneal microstructural changes with use of rigid gas permeable contact lenses (CLs) in keratoconus patients following collagen cross-linking (CXL). Methods: In a prospective, non-randomised, comparative case series, keratoconus patients with documented progression were offered CXL (365 nm, 3 mW/cm 2, 30 min with 0.1% riboflavin). Patients who refused CXL were fitted with CL and followed up for 6 months (keratoconus (KL)-CL; 25 eyes). Patients who underwent CXL were either fitted with CL 3 months after the procedure (CXL-CL; 26 eyes) or followed up with only spectacle correction (CXL-SL; 21 eyes). Outcome measures of over-refraction and corneal microstructure (confocal microscopy) were evaluated at time of CXL and 1, 2, 3, 4, 6 and 9 months after CXL. Results: There was a myopic shift in over-refraction by 0.37 D in CXL-CL (p=0.00), and 16/26 eyes required prescription of spectacles over CL to provide optimum vision; change in over-refraction was not seen in KC-CL. Patients using CL (CXL-CL and KC-CL) showed evidence of epithelial cell stress with increase in the superficial epithelial cell size and decrease in basal epithelial cell density. They also had a decrease in corneal sub-basal nerve plexus (CSNP) density and branching. Patients using spectacles after CXL showed regeneration of the sub-basal nerve plexus. Stromal keratocyte regeneration was unaffected with CL use. Conclusions: CL use after CXL is associated with a delay in the regeneration of the CSNP and epithelial cell stress.