Gel injection adjustable keratoplasty (GIAK) keratometric evaluation on eye bank eyes

H. Tahi, H. Kondo, B. Duchesne, W. Lee, W. Feuer, J. M. Parel

Research output: Contribution to journalConference articlepeer-review


Purpose. To assess keratometric changes of a new surgical refractive technique (Gel Injection Adjustable Keratoplasty or GIAK) on Eye Bank eyes. Conceived by G. Simon in 1989, GIAK consists of making a flat 360° intrastromal annular delamination track centered around the corneal apex and filling it with a soft gel. Methods. The track, which was made with customized helicoidal delaminators, was delaminated parallel to the corneal surface at 80% depth and was filled with a biocompatible crosslinked polyethylene oxide gel. The procedure was preformed on fresh cadaver eyes using 10 delaminators with different inner diameters (4.5, 5.0, 5.5, 6.0, 6.5, 7.0 mm) and widths (1.00 and 1.25 mm). The annular track was filled to capacity. Keratometric changes were evaluated with an automated surgical keratometer. Results. The keratometric changes induced by GIAK were between 3.4 and 11.9 diopters on average. Conclusions. This surgical technique effectively flattens the cornea and promises to be an effective technique for correction of myopia.

Original languageEnglish (US)
Pages (from-to)216-225
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventProceedings of Ophthalmic Technologies VIII - San Jose, CA, United States
Duration: Jan 24 1998Jan 25 1998


  • GIAK
  • Intracorneal ring
  • Keratoplasty
  • Myopia
  • Polyethylene oxide
  • Refractive surgery

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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