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Original article
Hemi-automated lamellar keratoplasty (HALK)
  1. Leonard H Yuen1,
  2. Jodhbir S Mehta1,2,
  3. Rania Shilbayeh1,
  4. Li Lim1,
  5. Donald T Tan1,2
  1. 1Singapore National Eye Centre, Singapore
  2. 2Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
  1. Correspondence to Professor Donald T Tan, Singapore National Eye Centre, 11 Third Hospital Avenue, Singapore 168751, Singapore; snecdt{at}pacific.net.sg

Abstract

Aim To describe a hybrid technique for anterior lamellar keratoplasty in corneas with topographical irregularities that circumvents the limitations of the microkeratome, namely reproduction of surface irregularities in the lamellar cut when creating the recipient flap.

Method Hemi-automated lamellar keratoplasty, a procedure that combines manual recipient bed lamellar dissection with automated donor preparation using a microkeratome, was performed on 14 eyes of 14 patients with heterogeneous causes of anterior stromal scarring.

Results There was an overall improvement in uncorrected visual acuity (UCVA) in 78.6% (11/14) eyes and in best-corrected visual acuity (BCVA) in 78.6% (11/14) eyes at a mean of 9 months postoperatively. Mean preoperative and postoperative logMAR UCVAs were 1.31±0.74 and 0.83±0.46 (p=0.04), respectively. Mean preoperative and postoperative logMAR BCVAs were 0.72±0.58 and 0.38±0.23 (p=0.05). Mean preoperative and postoperative manifest refractive spherical equivalents were −0.76±3.61 D and −0.52±3.44 D (p=0.872). There was no difference in preoperative and postoperative sphere and cylinder (p=0.871 and 0.965, respectively). In a subset of six eyes with longer follow-up >12 months, the UCVA and BCVA show continuing improvement. All grafts remained clear at the final appointment.

Conclusions Hemi-automated lamellar keratoplasty is an effective and safe surgical procedure in the treatment of corneas with irregular topographic profiles with varying depths of anterior stromal scarring. It combines the benefits of smooth microkeratome lamellar dissection of the donor with customised lenticule thickness and diameter together with a manual lamellar dissection technique for the recipient providing encouraging visual outcomes that show continuing improvement with time.

  • Treatment medical
  • epidemiology
  • treatment other
  • optics and refraction
  • public health
  • experimental and animal models
  • genetics
  • imaging
  • treatment lasers
  • clinical trial
  • treatment medical
  • eye (tissue) banking
  • contact lens
  • treatment surgery

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Footnotes

  • This study was presented as an e-Poster at the World Cornea Congress VI 2010 in Boston, USA.

  • Competing interests None.

  • Ethics approval This study was approved by the ethics committee at Singapore National Eye Centre.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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