Artikel
Changes of corneal higher order aberrations and corneal topography after CXL (K)
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Veröffentlicht: | 5. Mai 2014 |
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Purpose: To evaluate changes of corneal higher order aberrations and corneal topography after CXL in remote postoperative period.
Methods: The investigated group included 72 patients (87 eyes) with a diagnosis of grade II-III progressive keratoconus, who have undergone UV CXL. The main outcome measures included UCVA, BCVA, spherical equivalent value, keratotopography features and higher order aberrations. Corneal status was estimated before the operation and 1, 3, 6 and 12 months after.
Results: UCVA has increased, and spherical equivalent has decreased 6 months after surgery. BCVA has increased in the postoperative period correlating with a decrease of corneal higher order aberrations. Maximum values of front corneal surface elevation have increased by 1 month after surgery, and have decreased by 6 months after CXL. Corneal thickness continued to decrease and maximum values of back corneal surface elevation increased in the postoperative follow-up period.
Conclusions: Improvement of the corneal optical properties is caused by a decrease of its higher order aberrations which improves BCVA after CXL . An increase of UCVA is associated with improved corneal topographic parameters in the zone of ultraviolet light influence on riboflavin. We also assume that in the posterior layers of the cornea progression of the disease goes on which is proved by continued decrease of corneal thickness and increase of maximum values of back corneal surface elevation in the late postoperative period.