Změny rohovkové topografie a pachymetrie po riboflavin-UVA korneálním cross-linkingu
| Title in English | The changes of corneal topography and pachymetry after riboflavin-UVA corneal collagen crosslinking. |
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| Authors | |
| Year of publication | 2008 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | Authors describe the changes of corneal topography 6 months after riboflavin-UVA corneal collagen crosslinking (CCL) and evaluate relation between optical (Orbscan II, Bausch&Lomb) and ultrasound pachymetry (UP-1000, Nidek) measurement after CCL. The prospective nonrandomized study included twenty-one eyes of 20 consecutive subjects with diagnose of keratoconus. The standard CCL procedure was performed, with no complications. The changes of subjective refraction, topographic parameters (Sim K, Kmax, Kmin, central corneal thickness (CCT), the thinnest pachymetry (Pachmin)) and ultrasound pachymetry were evaluated and compared pre- and postoperatively. UCVA, spherical refraction and cylinder were not significantly altered by the treatment. BCVA values decreased 1 month after CCL then returned to preoperative levels . Kmax and Kmin values were decreasing from the 2nd month after CCL (by 1.42D and 1.22D resp.). The central corneal thickness measured by optical pachymeter Orbscan was significantly smaller than that measured by ultrasound pachymeter. The corneal thinning indicated by Orbscan (by 130 mikrom on average) was not confirmed clinically in any case and thus it seems that Orbscan pachymetry precision is impaired by the changes after CCL. |