Optical profilometry of poly(methylmethacrylate) surfaces after reshaping with a scanning photorefractive keratectomy (SPRK) system

Fabrice Manns, Pascal Rol, Jean Marie Parel, Armin Schmid, Jin Hui Shen, Takaaki Matsui, Per Söderberg

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A prototype frequency-quintupled Nd:YAG laser was used with a scanning system to create, on poly(methylmethacrylate) (PMMA) blocks, ablations corresponding to a correction of 6 diopters of myopia by photorefractive keratectomy. The topography of the ablated samples was measured with an optical profilometer to evaluate the smoothness and accuracy of the ablations. The ablation depth was larger than expected. With a 50% to 70% spot overlap, large valleylike variations with a maximum peak-to-peak amplitude of 20 pm were observed. With an 80% spot overlap, the rms surface roughness was 1.3 μm, and the central flattening was 7 diopters. This study shows that optical profilometry can be used to determine precisely the ablation per pulse and the smoothness and accuracy of surface ablations. Knowing the exact ablation per pulse is necessary to produce a smooth and accurate corneal surface by scanning photorefractive keratectomy.

Original languageEnglish (US)
Pages (from-to)3338-3346
Number of pages9
JournalApplied Optics
Volume35
Issue number19
DOIs
StatePublished - Jul 1 1996

Keywords

  • Cornea
  • Laser surgery
  • Photorefractive keratectomy
  • Profilometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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