May 2007
Volume 48, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2007
A New Design of Contact Lens to Reduce Higher-Order Aberrations in Decentered Position
Author Affiliations & Notes
  • A. Suzaki
    Osaka University Graduate School of Medicine, Suita, Japan
    Department of Applied Visual Science,
  • A. Kobayashi
    Clinical Laboratory, Menicon Co., Ltd., Nagoya, Japan
  • N. Maeda
    Osaka University Graduate School of Medicine, Suita, Japan
    Department of Ophthalmology,
  • T. Fujikado
    Osaka University Graduate School of Medicine, Suita, Japan
    Department of Applied Visual Science,
  • Footnotes
    Commercial Relationships A. Suzaki, None; A. Kobayashi, Menicon Co., Ltd., E; N. Maeda, None; T. Fujikado, None.
  • Footnotes
    Support None.
Investigative Ophthalmology & Visual Science May 2007, Vol.48, 5374. doi:
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    • Get Citation

      A. Suzaki, A. Kobayashi, N. Maeda, T. Fujikado; A New Design of Contact Lens to Reduce Higher-Order Aberrations in Decentered Position. Invest. Ophthalmol. Vis. Sci. 2007;48(13):5374.

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

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Abstract

Purpose:: Traditional contact lenses (T-CLs) are designed by considering the optical quality of the lens itself. More recently, some new CLs (N-CLs) provide a better optical quality when they are well-centered on the cornea. However, the optical quality of the eye/CL system is deteriorated by lens decentation. We have developed a specially designed CL (S-CL) to improve the optical aberration in the eye/CL system even in the decentered position. In this study, we examined the optical aberrations induced in the eye/CL optical system by a S-CL and compared with those induced by T-CL and N-CL when the lenses were centered (on-axis) or decentered (off-axis) with respect to the pupil center.

Methods:: The higher-order aberrations (HOA) of the eye/CL system induced by the T-CL, N-CL and S-CL with different front curve eccentricities when fitted on- and off-axis were evaluated. Optical aberrations were calculated by ray-tracing in a model eye/CL system (CL/tear/Gullstrand model eye) using specialized software (ZEMAX: ZEMAX Development Corporation, WA, USA).

Results:: On-axis spherical aberration induced by the N-CL was reduced compared to the T-CL. However, the reduction in aberrations with the N-CL depends on the amount of lens decentration and third-order aberrations increased (0.40µm) when the lens was off-axis. In contrast, the S-CL showed a large reduction in HOA (0.08µm) compared with N-CL (0.40µm) when the lens was decentered (10 deg), mainly due to the reduction of thired-order aberrations. The spherical aberration with S-CL increased at on-axis, however, the absolute value of spherical aberration (0.08µm) was similar to that reported in normal human eyes (0.10µm).

Conclusions:: The reduction in off-axis HOA with the specially designed CL was mainly due to a reduction in third-order aberrations and is likely to provide better on-eye optical performance compared to traditional or new CL.

Keywords: contact lens • contrast sensitivity • visual acuity 
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