Femtosecond Laser-Assisted Keratoplasty

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT01695811

Acronym

FLAK

Enrollment

Registered

2012-09-28

Start date

2007-11-30

Completion date

2013-12-31

Last updated

2015-01-21

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

Conditions

Keratoconus

Keywords

Keratoconus, PKP, femtosecond laser assisted keratoplasty

Brief 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. 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.

Interventions

None listed

Study design

Observational model

CASE_CONTROL

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

1. Corneal opacification. 2. Reduced ETDRS-measured, best corrected, distance visual acuity to 20/40 or worse. 3. Ability to participate in follow-up visits..

Exclusion criteria

1. Corneal opacification adequately dense to obscure visualization of iris. 2. ETDRS-measured, best-corrected, distance visual acuity of 20/30 or better. 3. Corneal thickness greater than 1200 µm at the 9 mm peripheral zone. 4. Severe corneal thinning including descemetocoele with impending corneal rupture. 5. Prior PKP or incisional surgery that may provide a potential space into which the gas produced by the procedure can escape. 6. Poor visual potential in the non-study eye (VA of 20/100 or less, without potential for improvement by the examining ophthalmologist's judgment). 7. History of glaucoma, including steroid response rise in intraocular pressure. 8. Active intraocular inflammation or infection. 9. Age 18 or younger (consideration will be given to an upper age limit). 10. Unable to return for scheduled follow-up examinations. 11. Other medical condition(s) that will likely prevent long term follow-up.

Design outcomes

Primary

Measure	Time frame	Description
Surgical outcomes	1 day, 1 week, 1, 3, 6, 12, 18 and 24 months	Wound healing, surgical complications, visual function and endothelial layer assessment

Outcome results