December 2002
Volume 43, Issue 13
Free
ARVO Annual Meeting Abstract  |   December 2002
Evaluation of Visual Function Using a New Point Spread Function Analysis System in LASIK Patients
Author Affiliations & Notes
  • K Ohno
    Department of Ophthalmology National Tokyo Medical Center Tokyo Japan
  • K Negishi
    Department of Ophthalmology Keio University School of Medicine Tokyo Japan
  • K Kobayashi
    Topcon R&D Center Tokyo Japan
  • M Shibutani
    Topcon R&D Center Tokyo Japan
  • G Takeuchi
    Topcon R&D Center Tokyo Japan
  • K Ohnuma
    Chiba University Faculty of Engineering Chiba Japan
  • N Hirayama
    HOYA Healthcare Corporation Tokyo Japan
  • T Noda
    Department of Ophthalmology National Tokyo Medical Center Tokyo Japan
  • Footnotes
    Commercial Relationships   K. Ohno, None; K. Negishi, None; K. Kobayashi, Topcon Corporation E; M. Shibutani, Topcon Corporation E; G. Takeuchi, Topcon Corporation E; K. Ohnuma, None; N. Hirayama, None; T. Noda, None.
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 2020. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      K Ohno, K Negishi, K Kobayashi, M Shibutani, G Takeuchi, K Ohnuma, N Hirayama, T Noda; Evaluation of Visual Function Using a New Point Spread Function Analysis System in LASIK Patients . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2020.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Abstract: : Purpose:To evaluate visual function in eyes that underwent LASIK to correct high or low myopia and to objectively simulate the vision of those eyes. Methods:The modulation transfer function (MTF) was obtained under cycloplegia in LASIK patients pre- and postoperatively using a new point spread function analysis system (PSFAS). The pattern in MTF was checked with the corrected refractive power after LASIK and the size of the artificial pupil (2, 4, or 6 mm). The retinal images of various sized Landolt's rings were simulated by convolution with single-pass PSF obtained by PSFAS. The effect of the corrected refractive power and the size of the artificial pupil on the contrast of those images was studied. Results:The postoperative MTF decreased compared with the preoperative MTF in all patients, and more so in high myopia than in low myopia. The MTF increased as the size of the artificial pupil decreased, within the sizes studied. The visual simulation of Landolt's rings objectively showed the difference in vision in those eyes. The contrast of the simulated retinal images decreased not only as the corrected refractive power increased but also as the size of the artificial pupil increased. Conclusion:Visual function in LASIK patients was affected both by the corrected power and the pupil size. The visual simulation using this system is clinically useful to objectively evaluate the visual function of these eyes.

Keywords: 500 optical properties • 519 physiological optics • 550 refractive surgery: optical quality 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×