KeratoconusFLAKNCT01695811
Femtosecond Laser-Assisted Keratoplasty
An observational study of Keratoconus, run by University of Michigan.
Trial summary
The purpose of this study will be to determine optimal surgical technique for performing FLAK including laser parameters, keratoplasty shape and suture technique in order to standardize surgical technique and to collect safety and efficacy data. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Keratoconus
- How many people
- 24 participants
- Where
- No sites listed yet
- Study dates
- Nov 2007to Dec 2013
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: subjects indicated for corneal transplant surgery
Who may be able to join
- Corneal opacification.
- Reduced ETDRS-measured, best corrected, distance visual acuity to 20/40 or worse.
- Ability to participate in follow-up visits..
Who cannot join
- Corneal opacification adequately dense to obscure visualization of iris.
- ETDRS-measured, best-corrected, distance visual acuity of 20/30 or better.
- Corneal thickness greater than 1200 µm at the 9 mm peripheral zone.
- Severe corneal thinning including descemetocoele with impending corneal rupture.
- Prior PKP or incisional surgery that may provide a potential space into which the gas produced by the procedure can escape.
- Poor visual potential in the non-study eye (VA of 20/100 or less, without potential for improvement by the examining ophthalmologist's judgment).
Show all 11Show fewer
- History of glaucoma, including steroid response rise in intraocular pressure.
- Active intraocular inflammation or infection.
- Age 18 or younger (consideration will be given to an upper age limit).
- Unable to return for scheduled follow-up examinations.
- Other medical condition(s) that will likely prevent long term follow-up.
About this study
The purpose of this study will be to determine optimal surgical technique for performing FLAK including laser parameters, keratoplasty shape and suture technique in order to standardize surgical technique and to collect safety and efficacy data. This will be compared to data of patients with full thickness PKP to measure visual outcomes, refraction, astigmatism, surgical methods and wound healing.
Read the detailed description
FLAK Instrument: The Femtosecond Laser (IntraLase Corporation, Irvine, CA) is a focusable infrared laser, similar to the more familiar neodymium-yttrium-aluminum-garnet (YAG) laser, but uses shorter pulses in the hundred-femtosecond (100 X 10-15 seconds) duration range. There is minimal postoperative inflammation and collateral tissue damage.
Subjects: We will be enrolling subjects 18 years or older that need keratoplasty based on clinical findings. Subjects will be enrolled regardless of race or gender on a first come first serve basis. Subjects will be recruited from the physicians own clinic.
PKP Subjects: We will do a retrospective chart review on subjects who have undergone traditional PKP. FLAK eyes will be age and gender matched to these PKP eyes to compare visual outcomes, wound healing and complications.
- Conditions
- Keratoconus
- Keywords
- Keratoconus, PKP, femtosecond laser assisted keratoplasty
- Medical subject headings
- Keratoconus
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| FLAK | FLAK | |
| PKP | Retrospective |
What is being measured
The primary outcome is the main question the study is designed to answer.
Surgical outcomes
Wound healing, surgical complications, visual function and endothelial layer assessment
Measured: 1 day, 1 week, 1, 3, 6, 12, 18 and 24 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 Sep 2012 (estimated)
- Study startNov 2007
- Primary completionMar 2012
- Study completionDec 2013
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for KeratoconusStudies of the same condition, open and under way.
- More trials run by University of MichiganThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case-control
- Time perspective
- Prospective
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Michigan
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Shahzad Mian, University of Michigan
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01695811
- Sponsor's protocol ID
- FLAK-15615
- Acronym
- FLAK
- Status last verified
- Jan 2015
- First submitted
- 27 Sep 2012
- Last updated
- 21 Jan 2015
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 21 Jan 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Femtosecond Laser-Assisted Keratoplasty
- ClinicalTrials.gov ID
- NCT01695811
- Acronym / sponsor ID
- FLAK / FLAK-15615
- Conditions
- Keratoconus
- Keywords
- Keratoconus, PKP, femtosecond laser assisted keratoplasty
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- University of MichiganUniversity, hospital or other
- Study start
- Nov 2007
- Primary completion
- Mar 2012 (actual)
- Study completion
- Dec 2013 (actual)
- First posted
- 28 Sep 2012 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study will be to determine optimal surgical technique for performing FLAK including laser parameters, keratoplasty shape and suture technique in order to standardize surgical technique and to collect safety and efficacy data. This will be compared to data of patients with full thickness PKP to measure visual outcomes, refraction, astigmatism, surgical methods and wound healing.
Detailed description
FLAK Instrument: The Femtosecond Laser (IntraLase Corporation, Irvine, CA) is a focusable infrared laser, similar to the more familiar neodymium-yttrium-aluminum-garnet (YAG) laser, but uses shorter pulses in the hundred-femtosecond (100 X 10-15 seconds) duration range. There is minimal postoperative inflammation and collateral tissue damage.
Subjects: We will be enrolling subjects 18 years or older that need keratoplasty based on clinical findings. Subjects will be enrolled regardless of race or gender on a first come first serve basis. Subjects will be recruited from the physicians own clinic.
PKP Subjects: We will do a retrospective chart review on subjects who have undergone traditional PKP. FLAK eyes will be age and gender matched to these PKP eyes to compare visual outcomes, wound healing and complications.
Study design
- Observational model
- Case-control
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| FLAK | – | –FLAK |
| PKP | – | –Retrospective |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- subjects indicated for corneal transplant surgery
Key inclusion criteria (3 listed)
- Corneal opacification.
- Reduced ETDRS-measured, best corrected, distance visual acuity to 20/40 or worse.
- Ability to participate in follow-up visits..
Key exclusion criteria (11 listed)
- Corneal opacification adequately dense to obscure visualization of iris.
- ETDRS-measured, best-corrected, distance visual acuity of 20/30 or better.
- Corneal thickness greater than 1200 µm at the 9 mm peripheral zone.
- Severe corneal thinning including descemetocoele with impending corneal rupture.
- Prior PKP or incisional surgery that may provide a potential space into which the gas produced by the procedure can escape.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Surgical outcomes
Time frame: 1 day, 1 week, 1, 3, 6, 12, 18 and 24 months
Wound healing, surgical complications, visual function and endothelial layer assessment
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Jan 2015.
Related trials for Keratoconus
RecruitingObservational study
UNITY DX Cornea Study
Tomography
Not yet recruiting
Performance Evaluation of the OCUTOP Hand-held Corneal Topographer
Corneal Topography, Dry Eye Syndromes
Recruiting
Proof-of-Concept for a Novel Optical Aperture Contact Lens in Presbyopia and Keratoconus
Keratoconus, Presbyopia
RecruitingObservational study
A Study to Test the Diagnostic Potential of Brillouin Microscopy for Corneal Ectasia
Keratoconus, Ectasia
Enrolling by invitationObservational study
Corneal Biomechanical Analysis Using Brillouin Microscopy
Keratoconus, Keratoconus, Unstable
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
Questions about this trial
What is this clinical trial studying?
An observational study of Keratoconus, run by University of Michigan.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Jan 2015. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Surgical outcomes (time frame: 1 day, 1 week, 1, 3, 6, 12, 18 and 24 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Jan 2015.