Femtosecond laser-assisted intracorneal ring segment implantation(Ferrara Ring) for correction of keratoconus.

Femtosecond laser-assisted intracorneal ring segment implantation(Ferrara Ring) for correction of keratoconus. - Femtosecond laser-assisted ICRS for correction of keratoconus.

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000023908

Enrollment

Registered

2016-09-02

Start date

2015-03-18

Completion date

Unknown

Last updated

2026-06-29

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

Conditions

Keratoconus

Interventions

We perform femtosecond laser-assisted intracorneal ring segment implantation(Ferrara Ring)to patients.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1) The mild to moderate case that had a diagnosis of a conical cornea in Keio University Hospital 2) Case with more than 400 micro metre of penumbra cornea thickness (segment episode) 3) Age: 20 years old or older 4) The case that is available for follow-up after an operation more than one year 5) The patient that the document agreement was provided about the treatment using the cornea segment

Exclusion criteria

Exclusion criteria: A case not to meet the uptake standard mentioned above. There is other ophthalmopathy (including cornea herpes, a cataract, the retina disease) Under the pregnancy The patient whom the explanation of mental abnormality or the doctor cannot understand The special occupation that a refraction cure is not permitted The patient who judged that the medical attendant was inappropriate

Design outcomes

Primary

Measure	Time frame
Visual acuity	—

Secondary

Measure	Time frame
Corneal topography	—

Countries

Japan

Contacts

Public ContactShigeto Shimmura

Keio university school of medicine Department of Ophthalmology

shige@z8.keio.jp03-3353-1211

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026