Optical comparison of multizone and single zone photo-refractive keratectomy

Xóchitl González-Cirre, Fabrice Manns, Pascal O. Rol, Jean Marie A. Parel

Research output: Contribution to journalConference articlepeer-review


Purpose: To calculate and compare the point-spread function (PSF) and the central ablation depth (CAD) of a paraxial eye model after photo-refractive keratectomy (PRK), with single and multizone treatments. Method: A modified Le Grand-El Hage paraxial eye model, with a pupil diameter ranging from 2 to 8 mm was used. Ray-tracing was performed for initial myopia ranging from 1 to 10D; after single zone PRK; after double zone PRK; and after tripe zone PRK. The ray-tracing of a parallel incident beam was calculated by using the paraxial matrix method. Results: At equal CAD, the optical image quality is better after single zone treatments. Conclusion: Multizone treatments do not seem to be advantageous optically.

Original languageEnglish (US)
Pages (from-to)164-170
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 1997
EventOphthalmic Technologies VII - San Jose, CA, United States
Duration: Feb 8 1997Feb 8 1997


  • Eye model
  • Photo-refractive keratectomy
  • Ray-tracing

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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