Deep Laser-Assisted Lamellar Anterior Keratoplasty with Microkeratome-Cut Grafts

Hideaki Yokogawa, Maolong Tang, Yan Li, Liang Liu, Winston Chamberlain, David Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Purpose: The goals of this laboratory study were to evaluate the interface quality in laser-assisted lamellar anterior keratoplasty (LALAK) with microkeratome-cut grafts and achieve good graft- host apposition. Methods: Simulated LALAK surgeries were performed on 6 pairs of eye-bank corneoscleral discs. Anterior lamellar grafts were precut with microkeratomes. Deep femtosecond (FS) laser cuts were performed on host corneas followed by excimer laser smoothing. Different parameters of FS laser cuts and excimer laser smoothing were tested. Optical coherence tomography was used to measure corneal pachymetry and evaluate graft-host apposition. The interface quality was quantified in a masked fashion using a 5-point scale based on scanning electron microscopy images. Results: Deep FS laser cuts at 226 to 380 mm resulted in visible ridges on the host bed. Excimer laser smoothing with a central ablation depth of 29 mm and saline as a smoothing agent did not adequately reduce ridges (score = 4.0). Deeper excimer laser ablation of 58 mm and Optisol-GS as a smoothing agent smoothed ridges to an acceptable level (score = 2.1). Same sizing of the graft and host cut diameters with an approximately 50-mm deeper host side cut relative to the central graft thickness provided the best graft-host fit. Conclusions: Deep excimer laser ablation with a viscous smoothing agent was needed to remove ridges after deep FS lamellar cuts. The host side cut should be deep enough to accommodate thicker graft peripheral thickness compared with the center. This LALAK design provides smooth lamellar interfaces, moderately thick grafts,and good graft-host fits.

Original languageEnglish (US)
Pages (from-to)706-712
Number of pages7
JournalCornea
Volume35
Issue number5
DOIs
StatePublished - 2016

Fingerprint

Corneal Transplantation
Lasers
Transplants
Excimer Lasers
Laser Therapy
Eye Banks
Corneal Pachymetry
Optical Coherence Tomography
Electron Scanning Microscopy
Cornea

Keywords

  • anterior lamellar keratoplasty
  • excimer laser
  • femtosecond laser

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Deep Laser-Assisted Lamellar Anterior Keratoplasty with Microkeratome-Cut Grafts. / Yokogawa, Hideaki; Tang, Maolong; Li, Yan; Liu, Liang; Chamberlain, Winston; Huang, David.

In: Cornea, Vol. 35, No. 5, 2016, p. 706-712.

Research output: Contribution to journalArticle

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