Pentacam Findings After Implantation of Intrastromal Corneal Rings in Keratoconus.

Assiut University

Status: Enrolling

Conditions: Keratoconus

Treatments: Device: corneal tomography scans

Study type: Observational

Funder types: Other

Identifiers

NCT04562064

PICR

Details and patient eligibility

About

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.

Enrollment: 44 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Keratoconus grade I, II and III according to the mean K Amsler-Krumeich classification.
• Contact lens intolerance.
• Thinnest location is more than 400 um.
• Maximum keratometry (Kmax) between 48 and 64 D.
• Clear cornea with no Vogt's striae.

Exclusion criteria

• Previous corneal surgery.
• Grade IV with corneal scarring.
• Concurrent corneal disease in addition to KC.
• Autoimmune or systemic connective tissue diseases.

Trial design

44 participants in 1 patient group

keratoconus group

Description:

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

Treatment:

Device: corneal tomography scans