Scheimpflug Versus Placido-disc System in Evaluation of Corneal Higher-Order Aberrations
Aim of work:

To assess the agreement between placido-based topographer (wavelight allegro topolyzer vario) and scheimpflug -based (Oculus Pentacam ) regard measuring corneal higher order aberrations before and after LASIK.
- EligibilityCriteria: Inclusion Criteria:  Patients with refractive errors from +6 diopters to -8 diopters sphere and up to -6diopters cylinder.  Exclusion Criteria:  Patients with systemic diseases such as diabetes. keratoconus or keratoconus suspect, amblyopic eyes. Patients with best corrected visual acuity (BCVA) not achieving 20/25. glucoma Previous ocular surgeries or trauma. - HealthyVolunteers: No - Gender: All - MinimumAge: 18 Years - MaximumAge: 45 Years - StdAgeList: Adult - StudyPopulation: Patients who will undergo LASIK - SamplingMethod: Non-Probability Sample