Corneal Topography Asymmetry Indices Changes After Corneal Refractive Surgery
NCT ID: NCT04589091
Last Updated: 2022-02-08
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
30 participants
OBSERVATIONAL
2021-04-13
2022-01-30
Brief Summary
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Detailed Description
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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.
Conditions
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Study Design
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OTHER
RETROSPECTIVE
Study Groups
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Group(1): Patient who underwent PRK
Refractive surgery
Refractive surgery for correction of error of refraction
Group(2): Patient underwent LASIK
Refractive surgery
Refractive surgery for correction of error of refraction
Interventions
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Refractive surgery
Refractive surgery for correction of error of refraction
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
* 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
19 Years
35 Years
ALL
No
Sponsors
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Tanta University
OTHER
Responsible Party
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Dina Tadros
Lecturer of ophthalmology , Tanta University Hospital
Locations
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Tanta University Hospital
Tanta, El-Garbeia, Egypt
Countries
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References
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Bailey MD, Zadnik K. Outcomes of LASIK for myopia with FDA-approved lasers. Cornea. 2007 Apr;26(3):246-54. doi: 10.1097/ICO.0b013e318033dbf0.
Sridhar MS, Rao SK, Vajpayee RB, Aasuri MK, Hannush S, Sinha R. Complications of laser-in-situ-keratomileusis. Indian J Ophthalmol. 2002 Dec;50(4):265-82.
Mohammadi SF, Nabovati P, Mirzajani A, Ashrafi E, Vakilian B. Risk factors of regression and undercorrection in photorefractive keratectomy: a case-control study. Int J Ophthalmol. 2015 Oct 18;8(5):933-7. doi: 10.3980/j.issn.2222-3959.2015.05.14. eCollection 2015.
Belin MW, Ambrosio R Jr. Corneal ectasia risk score: statistical validity and clinical relevance. J Refract Surg. 2010 Apr;26(4):238-40. doi: 10.3928/1081597X-20100318-01. No abstract available.
Other Identifiers
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34081/9/20
Identifier Type: -
Identifier Source: org_study_id
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