This purpose of this study is to compare a new form of LASIK called Ray Tracing Guided LASIK to 3 other forms of corneal refractive surgery: 1. KLEx (KeratoLenticule Extraction) using the Zeiss Visumax 800 Laser, 2. WFO LASIK (Wavefront Optimized LASIK) using the Alcon EX500 Laser, and 3. Topography Guided LASIK (Contoura LASIK) also using the Alcon EX500 Laser.
Age 22-50 at the time of consent
Diagnosis of myopia or myopia with astigmatism with Preoperative manifest spherical equivalent refraction of ≥ -2.00 and ≤ -9.00 D (-2.00 D through -9.00 D)
Preop Spherical component of ≥ -2.00 and ≤ -8.00 D (-2.00 D through -8.00 D)
Refractive Cylinder of ≤ -3.00 D (0.00 through -3.00 D)
Clinically significant dry eye on clinical examination, as determined by the investigator
Irregular astigmatism, keratoconus, keratoconus suspect, or abnormal corneal tomography
History of corneal dystrophies or guttata
History of herpetic keratitis or active disease
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Treatment groupsSee each treatment group below.