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Optical Quality of the Eye Degraded by Time-Varying Wavefront Aberrations with Tear Film Dynamics

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Abstract

Purpose

Wavefront aberrations (WFAs) of the eye vary with time because of the tear film dynamics. We investigated, using a simulation method, the variation of optical quality with time-varying wavefront measurements of 13 eyes with different refractions.

Methods

WFAs of 13 normal eyes of 13 subjects were measured every second for 10 s. First, we simulated WFAs with conventional corneal laser refractive surgery by subtracting the second-order aberrations of the least aberrated measurement from measured consecutive WFAs. Second, we simulated customized refractive surgery by subtracting the second- to sixth-order aberrations of the least aberrated measurement from measured consecutive WFAs. We calculated Strehl ratios and retinal images from these corrected consecutive WFAs.

Results

In one eye, the root mean square (RMS) values of WFAs with a second-order correction were sometimes smaller than those of WFAs with a second- to sixth-order correction, when these were compared at the same time point after a blink. However, in the other 12 eyes, the RMS values with second- to sixth-order corrections were smaller than those with only a second-order correction. In eight eyes, the Strehl ratios with second- to sixth-order corrections were larger than those with second-order corrections. In the remaining five eyes, Strehl ratios with second- to sixth-order corrections were sometimes smaller than those with second-order corrections.

Conclusions

In a simulation, the correction of time-invariant higher order aberrations usually reduced RMS values, but it did not always result in higher Strehl ratios than those obtained with only second-order corrections. Jpn J Ophthalmol 2007;51:258–264 @ Japanese Ophthalmological Society 2007

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Authors and Affiliations

  1. Department of Applied Visual Science, Osaka University Graduate School of Medicine, Osaka, Japan

    Yoko Hirohara, Toshifumi Mihashi, Sayuri Ninomiya & Takashi Fujikado

  2. Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan

    Shizuka Koh & Naoyuki Maeda

  3. Research Institute, Topcon Corporation, Tokyo, Japan

    Yoko Hirohara & Toshifumi Mihashi

Authors
  1. Yoko Hirohara
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  2. Toshifumi Mihashi
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  3. Shizuka Koh
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  4. Sayuri Ninomiya
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  5. Naoyuki Maeda
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  6. Takashi Fujikado
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Corresponding author

Correspondence to Takashi Fujikado.

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Hirohara, Y., Mihashi, T., Koh, S. et al. Optical Quality of the Eye Degraded by Time-Varying Wavefront Aberrations with Tear Film Dynamics. Jpn J Ophthalmol 51, 258–264 (2007). https://doi.org/10.1007/s10384-007-0440-7

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  • DOI: https://doi.org/10.1007/s10384-007-0440-7

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