May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Measuring higher order aberrations of customized contact lenses
Author Affiliations & Notes
  • M. Menon
    Biomedical Engineering,
    University of Rochester, Rochester, NY
  • G. Yoon
    Department of Ophthalmology,
    University of Rochester, Rochester, NY
  • T.M. Jeong
    Center for Visual Science,
    University of Rochester, Rochester, NY
  • Footnotes
    Commercial Relationships  M. Menon, None; G. Yoon, Bausch & Lomb F, C; T.M. Jeong, None.
  • Footnotes
    Support  NIH/NEI R01 EY014999, NYSTAR/CEIS, Research to Prevent Blindness (RPB), Bausch & Lomb
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 2847. doi:
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      M. Menon, G. Yoon, T.M. Jeong; Measuring higher order aberrations of customized contact lenses . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2847.

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

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Abstract

Abstract: : Purpose:Reliable measurement of the higher order aberrations (HOA) of contact lenses in air is difficult due to dehydration and non–uniform tear film thickness. The goal of this study was to measure the HOA of customized contact lenses using a Shack–Hartmann wavefront sensor. Methods:Contact lenses were measured after submerging them in lens solution. Due to a smaller refractive index difference between the contact lens and lens solution, a high sensitivity Shack–Hartmann wavefront sensor was required to accurately measure HOA. A pupil camera and reticule were used for precise placement (decentration and rotation) of the contact lens. All data from the wavefront sensor was converted to corresponding data in air using a conversion factor based on the refractive index difference. The wavefront sensor was calibrated using an interferometer (Zygo). A phase plate that includes HOA was measured in air and in lens solution to verify the accuracy of our method. The wavefront aberrations of 5 prism ballasted lenses (4 conventional soft contact lenses and 1 customized soft contact lens) were measured and compared with manufacturer’s estimates. Results:The difference in the HOA RMS of the phase plate measured in air and in lens solution was 0.062 µm. The measurement repeatability of a conventional contact lens with sphere and cylinder was better than 0.01 D (standard deviation from measurements at 4 different times) in both sphere and cylinder. The magnitude of HOA was negligibly small. The mean of the measured sphere and cylinder of 4 conventional contact lenses was –1.32 D (manufacturer’s estimate: –1.27 D) and –0.84 D (manufacturer’s estimate: –1.10 D), respectively. The customized contact lens, fabricated to include coma and spherical aberration, was measured to have 0.78 µm of coma and 0.54 µm of spherical aberration. No other higher order aberration was observed in the customized contact lens. Conclusions:We have successfully developed a method to reliably measure the lower and higher order aberrations of conventional and customized contact lenses. This method can improve fabrication process of customized contact lenses for vision correction. The same wavefront sensor can be used to measure the optical quality of other types of lenses such as multifocal contact lenses and intraocular lenses.

Keywords: contact lens • optical properties • keratoconus 
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