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First Author: Z.Hassan HUNGARY
Co Author(s): L. Modis Jr E. Szalai A. Berta G. Nemeth
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To analyze results of a new device measuring corneal biomechanics after corneal refractive surgeries.
Orbi-Dent Health and Laser Center and Department of Ophthalmology, Medical Health and Science Centre, University of Debrecen, Hungary.
39 refractive surgery patients were enrolled to the study (age: 32.6ḟ9.9 years). Laser in situ keratomileusis (LASIK) was performed in 52 eyes of 26 patients, photorefractive keratectomy (PRK) was done in 26 eyes of 13 patients. Ten specific biomechanical parameters, intraocular pressure (IOP) and pachymetry were measured preoperatively and 1 day, 1 week and 1 month after surgeries with a new technology using Scheimpflug imaging.
In case of LASIK, the day after the procedure, radius values showed significant difference compared to preoperative data. After 1 month of surgery, radius values, velocity of the second applanation and pachymetric values showed significant difference compared to preoperative data. In case of PRK, the day after the procedure, significant differences in IOP, maximum amplitude at the apex, A1 time, A2 velocity and highest concavity time were measured. After 1 month of PRK, there were no differences in parameters compared to preoperative data except in pachymetry.
We observed that some specific biomechanical parameters changed measured with CorVis ST after LASIK and PRK, in the early postoperative time. However, most of these parameters remain unchanged after 1 month of LASIK and PRK compared to preoperative data. PRK is a less invasive procedure biomechanically than LASIK, verified by CorVis ST device.