Corneal collagen crosslinking using riboflavin and ultraviolet-A light for keratoconus: one-year analysis using Scheimpflug imaging.
PURPOSE: To evaluate changes in corneal curvature, corneal elevation, corneal thickness, lens density, and foveal thickness after corneal collagen crosslinking with riboflavin and ultraviolet-A (UVA) light in eyes with progressive keratoconus. SETTING: Grewal Eye Institute, Chandigarh, India. METHODS: Subjective refraction, best corrected visual acuity (BCVA), Scheimpflug imaging, and optical coherence tomography were performed preoperatively and 1 week, 1, 3, and 6 months, and 1 year after crosslinking. RESULTS: There were no significant differences (P > 0.05) in mean values between preoperatively and 1 year postoperatively, respectively, in BCVA (0.22 +/- 0.10 and 0.20 +/- 0.10), spherical equivalent (-6.30 +/- 4.50 diopters (D) and -4.90 +/- 3.50 D), or cylinder vector (1.58 x 7( degrees ) +/- 3.8 D and 1.41 x 24( degrees ) +/- 3.5 D). There was no significant difference in mean measurements between preoperatively and 1 year postoperatively, respectively, for central corneal thickness (458.9 +/- 40 microm and 455.2 +/- 48.6 microm), anterior corneal curvature (50.6 +/- 7.4 D and 51.5 +/- 3.6 D), posterior corneal curvature (-7.7 +/- 1.2 D and -7.4 +/- 1.1 D), apex anterior (P = .9), posterior corneal elevation (P = .7), lens density (P = .33), or foveal thickness (175.7 +/- 35.6 microm and 146.4 +/- 8.5 microm; P = .1). CONCLUSIONS: Stable BCVA, spherical equivalent, anterior and posterior corneal curvatures, and corneal elevation 1 year after crosslinking indicate that keratoconus did not progress. Unchanged lens density and foveal thickness suggest that the lens and macula were not affected after UVA exposure during crosslinking.
Grewal, DS; Brar, GS; Jain, R; Sood, V; Singla, M; Grewal, SPS
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