Mixed astigmatism is a type of refractive error in which the two principal steep and flat meridians focus the light in front and behind the retina, respectively.1 Laser vision correction (LVC) for mixed astigmatism is challenging as it involves a bitoric ablative pattern to flatten the steepest meridian and steepen the flattest one. The aim of the current study was to compare the visual and refractive outcomes of FS-LASIK versus single-step TransPRK for treatment of patients with mixed astigmatism.
Study Type
OBSERVATIONAL
Enrollment
39
Patients in the FS-LASIK group underwent flap creation using the femtosecond laser WaveLight FS200® (Alcon lab, TX, USA). After flap creation, wave-front optimized stromal ablation was performed with WaveLight EX-500 (WaveLight®; Alcon Laboratories, Fort Worth, TX, USA) for mixed astigmatism correction.
Patients in the single-step TransPRK group underwent StreamLight® PRK in WaveLight EX-500 Excimer laser (WaveLight®; Alcon Laboratories, Fort Worth, TX, USA). In a single step, epithelial ablation (based on epithelial mapping) followed by stromal ablation for mixed astigmatism correction, were accomplished.
TIBA Eye Center
Asyut, Asyut Governorate, Egypt
Uncorrected distance visual acuity (UDVA)
Visual acuity measurement using Snellen's Acuity Chart converted to logMAR notation.
Time frame: 24 months
Corrected distance visual acuity (CDVA)
Corrected visual acuity measurement using Snellen's Acuity Chart and converted to logMAR notation.
Time frame: 24 months
Postoperative refraction
Manifest sphere and cylinder measured by Topcon Auto-Keratorefractometer
Time frame: 24 months
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