Corneal Topography Asymmetry Indices Changes After Corneal Refractive Surgery

Summary

Participation Requirements

Description

Retrospectively review the medical records of all patients who underwent refractive surgery referred from the out-patient clinic of Tanta University hospital between September 2015 and September 2020 . Data collection will include: Preoperative and postoperative Evaluation: Age, sex, uncorrected dis...

Retrospectively review the medical records of all patients who underwent refractive surgery referred from the out-patient clinic of Tanta University hospital between September 2015 and September 2020 . Data collection will include: Preoperative and postoperative Evaluation: Age, sex, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest and cycloplegic refraction, Slit lamp biomicroscopy, fundus examination. Data of Corneal Tomography keratometric using Scheimpflug camera (Pentacam Oculus- Germany) :that includes the following indices Average keratometric value (K mean) in diopters Maximum simulated keratometry (Kmax) in diopters Index of Surface Variance (ISV) in microns Index of Vertical Asymmetey (IVA) in microns Radii Minimum (R min) in microns Index of height asymmetry (IHA) in microns Index of height decantation (IHD) in microns Aberration coefficient (ABR) The data of the pentacam will be collected pre-operative and analyzed at 1 month, 3 months and 6 months with recording of the complications.

Tracking Information