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Effects of corneal cross-linking on contrast sensitivity, visual acuity, and corneal topography in patients with keratoconus.
Lamy, Ricardo; Netto, Camila F; Reis, Ricardo G; Procopio, Bruno; Porco, Travis C; Stewart, Jay M; Dantas, Adalmir M; Moraes, Haroldo V.
Affiliation
  • Lamy R; Department of Ophthalmology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. lamy@ufrj.br
Cornea ; 32(5): 591-6, 2013 May.
Article in En | MEDLINE | ID: mdl-23023410
PURPOSE: To assess the effects of corneal collagen cross-linking (CXL) on contrast sensitivity (CS), visual acuity, and corneal topography investigating possible predictors of efficacy. METHODS: Sixty-eight eyes of 34 patients with progressive keratoconus were enrolled in this prospective study. CXL was performed in one eye and the other eye was left untreated as a control. CS, best spectacle-corrected visual acuity (BSCVA), simulated keratometry in the steepest meridian (SimK-s), mean power in the central 3-mm zone (C-MP), mean power in the paracentral 3- to 5-mm zone (P-MP), maximum keratometric power in the central zone (C-Kmax), and maximum keratometric power in the paracentral zone (P-Kmax) were evaluated at baseline, 40 days, 3 months, 6 months, 1 year, and after 2 years of follow-up. RESULTS: Treated eyes showed an improvement (P < 0.001) of +0.16 logCS and -0.16 logarithm of the minimum angle of resolution (logMAR) and a reduction in SimK-s of -0.61 diopter (D), C-Kmax -1.11 D, P-Kmax -0.99 D, C-MP -0.39 D, and P-MP -0.30 D. Of the treated eyes, 43.3% had a decrease in C-Kmax greater than 1 D, 50% by 0 to 0.99 D, and 6.7% had an increase of up to +0.89 D. Treated eyes with keratometric apex in the central 3-mm zone (CKA) improved BSCVA -0.19 logMAR and CS +0.19 logCS; whereas in treated eyes with paracentral keratometric apex (PKA), the improvement was -0.13 logMAR and +0.16 logCS. CONCLUSIONS: CXL with riboflavin and UV-A improved CS and inhibited the progression of keratoconus. As a predictor of treatment efficacy, eyes with CKA showed greater improvement in BSCVA after CXL when compared with eyes with PKA.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Contrast Sensitivity / Visual Acuity / Collagen / Corneal Stroma / Corneal Topography / Cross-Linking Reagents / Keratoconus Type of study: Diagnostic_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Cornea Year: 2013 Document type: Article Affiliation country: Brazil Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Contrast Sensitivity / Visual Acuity / Collagen / Corneal Stroma / Corneal Topography / Cross-Linking Reagents / Keratoconus Type of study: Diagnostic_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Limits: Adolescent / Adult / Female / Humans / Male Language: En Journal: Cornea Year: 2013 Document type: Article Affiliation country: Brazil Country of publication: United States