Femtosecond laser-assisted intrastromal corneal ring segment implantation for the treatment of high astigmatism correction in keratoconus, in corneal ectasia after refractive surgery and after penetrating keratoplasty in Chulalongkorn Memorial Hospital, 1-year results.

Femtosecond laser-assisted intrastromal corneal ring segment implantation for the treatment of high astigmatism correction in keratoconus, in corneal ectasia after refractive surgery and after penetrating keratoplasty in Chulalongkorn Memorial Hosp

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

TCTR

Registry ID

TCTR20170111001

Enrollment

Unknown

Registered

2017-01-11

Start date

2015-06-01

Completion date

Unknown

Last updated

2026-08-03

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

Conditions

&#45

Interventions

intrastromal coraneal ring segment implantation

Experimental Device

Eligibility

Sex/Gender

All

Age

18 Years to 60 Years

Inclusion criteria

Inclusion criteria: - Keratoconus - ectasia after refractive surgery - high astigmatism after penetrating keratoplasty These patients could not tolerate glasses or contact lens for refractive correction, so they underwent femtosecond laser-assisted intrastromal corneal ring segment implantation. They had been followed for at least 1 year postoperatively. They must also have corneal topography from pentacam at 1 year.

Exclusion criteria

Exclusion criteria: Patients as stated in the inclusion criteria but had no information about corneal topography from pentacam

Design outcomes

Primary

Measure	Time frame
uncorrected and best corrected visual acuity 1 year snellen chart,keratometric power 1 year diopter,spherical equivalent and manifest refraction 1 year minus cylinder form,Q value 1 year Pentacam measurement,Q value Pentacam measurement,thinnest point of corneal thickness 1 year Pentacam measurement	—

Secondary

Measure	Time frame
efficacy of intrastromal corneal ring segment for each type of keratoconus 1 year comparison of primary outcome	—

Countries

Thailand

Contacts

Public ContactDuangratn Niruthisard

Department of ophthalmology, King Chulalongkorn Memorial Hospital

duangratn.dn@gmail.com066-02-256-4142

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026

Femtosecond laser&#45;assisted intrastromal corneal ring segment implantation for the treatment of high astigmatism correction in keratoconus&#44; in corneal ectasia after refractive surgery and after penetrating keratoplasty in Chulalongkorn Memorial Hospital&#44; 1&#45;year results.

Conditions

Related papers

Interventions

Sponsors

Eligibility

Inclusion criteria

Exclusion criteria

Design outcomes

Primary

Secondary

Countries

Contacts

Outcome results

Femtosecond laser-assisted intrastromal corneal ring segment implantation for the treatment of high astigmatism correction in keratoconus, in corneal ectasia after refractive surgery and after penetrating keratoplasty in Chulalongkorn Memorial Hospital, 1-year results.