Corneal Topography Asymmetry Indices Changes After Corneal Refractive Surgery

Tanta University30 enrolled

Overview

To evaluate the changes that occur in the corneal indices after corneal refractive surgery either PRK or LASIK.

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 1. Average keratometric value (K mean) in diopters 2. Maximum simulated keratometry (Kmax) in diopters 3. Index of Surface Variance (ISV) in microns 4. Index of Vertical Asymmetey (IVA) in microns 5. Radii Minimum (R min) in microns 6. Index of height asymmetry (IHA) in microns 7. Index of height decantation (IHD) in microns 8. 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.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Myopia

Interventions

Refractive surgeryOTHER

Refractive surgery for correction of error of refraction

Eligibility

Sex: ALLMin age: 19 YearsMax age: 35 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patients who underwent refractive surgery either PRK, LASIK with age between 19 and 35 years old Exclusion Criteria: * Kertoconus. * Corneal scarring. * Previous corneal infections. * Minimum corneal thickness at the thinnest location less than 400 µm. * History of uveitis or ocular allergy. * Pre-existing glaucoma. * Data not available

Locations (1)

Tanta University Hospital

Tanta, El-Garbeia, Egypt

Outcomes

Primary Outcomes

To evaluate the changes that occur in the corneal indices after corneal refractive surgery either PRK or LASIK.

Using the results of measurements of Scheimpflug camera (Pentacam Oculus- Germany) :that includes the following indices 1. Average keratometric value (K mean) in diopters 2. Maximum simulated keratometry (Kmax) in diopters 3. Index of Surface Variance (ISV) in microns 4. Index of Vertical Asymmetey (IVA) in microns 5. Radii Minimum (R min) in microns 6. Index of height asymmetry (IHA) in microns 7. Index of height decantation (IHD) in microns 8. Aberration coefficient (ABR) The numbers from preoperative records will be compared with postoperative records after the refractive surgery is done . All the values will be expressed as mean ± standard deviation and the data will be analyzed as 1 months, 3 months and 6 months after surgery

Time frame: 6 months

Data from ClinicalTrials.gov

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