Keratoconus, Keratoconus Posterior
Conditions
Keywords
keratoconus, intracorneal ring segments, posterior corneal surface
Brief summary
Our purpose is to analyze the changes induced in the posterior corneal surface in patients implanted with intracorneal ring segments for treatment of keratoconus. Patients are assessed with corneal imaging device preoperatively and at 1, 3, 6 and 12 months postoperatively.
Detailed description
Procedure: Femtosecond laser assisted implantation of intracorneal ring segments in keratoconus patients Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, keratometric (K) readings of the anterior and posterior surface, corneal asphericity (Q value) of the anterior and posterior surface, and anterior and posterior elevations are evaluated using a corneal imaging device preoperatively and at 1, 3, 6 and 12 months after surgery.
Interventions
PROCEDUREIntracorneal ring segment implantation
Surgical procedure for keratoconus treatment. A tunnel is created in the corneal stroma with femtosecond laser and ring segments are implanted in the corneal stroma
Sponsors
Ain Shams University
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 40 Years
Healthy volunteers
No
Inclusion criteria
* Patients with keratoconus grade 1, 2 or 3 according to Amsler-Krumeich classification. * Best corrected visual acuity (BCVA) ≤ 6/12. * Mean front keratometric (K) readings ≤ 60 diopters (D). * Corneal thickness ≥ 400 µm at the location of ICRS implantation. * Clear central cornea
Exclusion criteria
* Central corneal opacity. * Previous corneal laser refractive surgery. * Previous corneal collagen cross linking. * Previous cataract surgery or phakic IOL implantation. * History of herpetic keratitis. * History of acute hydrops. * Ocular comorbidities such as cataract, glaucoma or retinal disease. * Systemic diseases affecting healing process such as autoimmune or connective tissue disease.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Posterior corneal astigmatism | Baseline to 12 months | It is measured by corneal imaging device preoperatively and postoperatively |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Visual Acuity | Baseline to 12 months | It is measured by Snellen Chart Acuity |
Countries
Egypt
Outcome results
None listed