Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry

Fabrice Manns, Pascal O. Rol, Jean-Marie A Parel, Armin Schmid, Jin Hui Shen, Takaaki Matsui, Per G M D Soderberg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The smoothness and accuracy of PMMA ablations with a prototype scanning photorefractive keratectomy (SPRK) system were evaluated by optical profilometry. A prototype frequency- quintupled Nd:YAG laser (Laser Harmonic, LaserSight, Orlando, FL) was used (wavelength: 213 nm, pulse duration: 15 ns, repetition rate: 10 Hz). The laser energy was delivered through two computer-controlled galvanometer scanners that were controlled with our own hardware and software. The system was programmed to create on a block of PMMA the ablations corresponding to the correction of 6 diopters of myopia with 60%, 70%, and 80% spot overlap. The energy was 1.25 mJ. After ablation, the topography of the samples was measured with an optical profilometer (UBM Messtechnik, Ettlingen, Germany). The ablation depth was 10 to 15 micrometer larger than expected. The surfaces created with 50% to 70% overlap exhibited large saw-tooth like variations, with a maximum peak to peak variation of approximately 20 micrometer. With 80% overlap, the rms roughness was 1.3 micrometer and the central flattening was 7 diopters. This study shows that scanning PRK can produce smooth and accurate ablations.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJean-Marie Parel, Karen M. Joos, Pascal O. Rol
Pages57-60
Number of pages4
Volume2673
StatePublished - Jan 1 1996
EventOphthalmic Technologies VI - San Jose, CA, USA
Duration: Jan 27 1996Jan 28 1996

Other

OtherOphthalmic Technologies VI
CitySan Jose, CA, USA
Period1/27/961/28/96

Fingerprint

Profilometry
Ablation
Scanning
Lasers
Galvanometers
Topography
Surface roughness
Hardware
Wavelength

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Manns, F., Rol, P. O., Parel, J-M. A., Schmid, A., Shen, J. H., Matsui, T., & Soderberg, P. G. M. D. (1996). Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry. In J-M. Parel, K. M. Joos, & P. O. Rol (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 2673, pp. 57-60)

Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry. / Manns, Fabrice; Rol, Pascal O.; Parel, Jean-Marie A; Schmid, Armin; Shen, Jin Hui; Matsui, Takaaki; Soderberg, Per G M D.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Jean-Marie Parel; Karen M. Joos; Pascal O. Rol. Vol. 2673 1996. p. 57-60.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Manns, F, Rol, PO, Parel, J-MA, Schmid, A, Shen, JH, Matsui, T & Soderberg, PGMD 1996, Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry. in J-M Parel, KM Joos & PO Rol (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 2673, pp. 57-60, Ophthalmic Technologies VI, San Jose, CA, USA, 1/27/96.
Manns F, Rol PO, Parel J-MA, Schmid A, Shen JH, Matsui T et al. Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry. In Parel J-M, Joos KM, Rol PO, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 2673. 1996. p. 57-60
Manns, Fabrice ; Rol, Pascal O. ; Parel, Jean-Marie A ; Schmid, Armin ; Shen, Jin Hui ; Matsui, Takaaki ; Soderberg, Per G M D. / Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry. Proceedings of SPIE - The International Society for Optical Engineering. editor / Jean-Marie Parel ; Karen M. Joos ; Pascal O. Rol. Vol. 2673 1996. pp. 57-60
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abstract = "The smoothness and accuracy of PMMA ablations with a prototype scanning photorefractive keratectomy (SPRK) system were evaluated by optical profilometry. A prototype frequency- quintupled Nd:YAG laser (Laser Harmonic, LaserSight, Orlando, FL) was used (wavelength: 213 nm, pulse duration: 15 ns, repetition rate: 10 Hz). The laser energy was delivered through two computer-controlled galvanometer scanners that were controlled with our own hardware and software. The system was programmed to create on a block of PMMA the ablations corresponding to the correction of 6 diopters of myopia with 60{\%}, 70{\%}, and 80{\%} spot overlap. The energy was 1.25 mJ. After ablation, the topography of the samples was measured with an optical profilometer (UBM Messtechnik, Ettlingen, Germany). The ablation depth was 10 to 15 micrometer larger than expected. The surfaces created with 50{\%} to 70{\%} overlap exhibited large saw-tooth like variations, with a maximum peak to peak variation of approximately 20 micrometer. With 80{\%} overlap, the rms roughness was 1.3 micrometer and the central flattening was 7 diopters. This study shows that scanning PRK can produce smooth and accurate ablations.",
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