Pentacam Findings After Implantation of Intrastromal Corneal Rings in Keratoconus.

Status

UNKNOWN

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04562064

Enrollment

Registered

2020-09-24

Start date

2020-12-01

Completion date

2022-11-30

Last updated

2022-08-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Keratoconus

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.

Interventions

DEVICEcorneal tomography scans

corneal tomography scans of the two corneal surfaces were obtained preoperatively and postoperatively with a rotating Scheimpflug imaging system

Study design

Observational model

OTHER

Time perspective

CROSS_SECTIONAL

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

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.

Design outcomes

Primary

Measure	Time frame	Description
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

Countries

Egypt

Contacts

Primary ContactMagdi M Mostafa, MD

magdimohammad2013@gmail.com01093122344

Backup ContactHani Elsodafy, MD

hanyelsedfy@yahoo.com01005263681

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026