Pentacam Findings After Implantation of Intrastromal Corneal Rings in Keratoconus.
Study Details
Study Description
Brief Summary
keratoconus is a progressive corneal ectatic disease characterized by paraxial stromal thinning and weakening, resulting in irregular astigmatism, corneal protrusion, and distortion of the anterior corneal surface. It is usually bilateral, although asymmetrical in most cases.
Intrastromal corneal rings are polymethylmethacrylate devices successfully used for the management of keratoconus, pellucid marginal degeneration, post-LASIK ectasia and myopia. Intrastromal corneal rings implantation is safe and reversible procedure that does not affect the central corneal area, and hence, avoids interference with visual axis. The goal of intrastromal corneal rings implantation is to improve visual acuity by regulariztion of the anterior corneal surface.
Condition or Disease | Intervention/Treatment | Phase |
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Study Design
Arms and Interventions
Arm | Intervention/Treatment |
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keratoconus group patients with keratoconus implanted with the Myoring 360 degree, KeraRing 355 degree, KeraRing one segment, KeraRing two segments ICRS .corneal tomography scans of the two corneal surfaces were obtained preoperatively and postoperatively with a rotating Scheimpflug imaging system .pentacam data that will be included |
Device: corneal tomography scans
corneal tomography scans of the two corneal surfaces were obtained preoperatively and postoperatively with a rotating Scheimpflug imaging system
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Outcome Measures
Primary Outcome Measures
- The percentage of changes of anterior corneal surface preoperatively compared to those values postoperativaly [1 month]
The changes of anterior corneal surface including flat (K1) and steep (K2) keratometry values, corneal astigmatism (Astig) preoperatively compared to those values postoperativaly
Eligibility Criteria
Criteria
Inclusion Criteria:
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Keratoconus grade I, II and III according to the mean K Amsler-Krumeich classification.
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Contact lens intolerance.
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Thinnest location is more than 400 um.
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Maximum keratometry (Kmax) between 48 and 64 D.
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Clear cornea with no Vogt's striae.
Exclusion Criteria:
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Previous corneal surgery.
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Grade IV with corneal scarring.
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Concurrent corneal disease in addition to KC.
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Autoimmune or systemic connective tissue diseases.
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
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1 | Assiut Faculty of Medicine | Assiut | Egypt |
Sponsors and Collaborators
- Assiut University
Investigators
None specified.Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- PICR