Japanese Journal of Visual Science
Online ISSN : 2188-0522
Print ISSN : 0916-8273
ISSN-L : 0916-8273
Volume 31 , Issue 3
Showing 1-7 articles out of 7 articles from the selected issue
Preface
Review Articles
Original Articles
  • Toyohiko Kashiwagi
    Type: ORIGINAL ARTICLES
    2010 Volume 31 Issue 3 Pages 102-113
    Published: 2010
    Released: November 08, 2019
    JOURNALS FREE ACCESS

    Depth of field (apparent accommodation) of aphakic eyes corrected with spectacles, contact lenses (CLs), spherical intraocular lenses (IOLs) and aspheric IOL were computed by convoluting optotype with a point spread function calculated by the Fresnel-Kirchhoff integral from wave aberration obtained via ray tracing. The square root of wave aberration (P-V value) correlated well with depth of focus. Depths of field calculated from depths of focus and the values obtained using the varied spectacle power method were almost equal. When exit pupil size was approximately 3.5mm and visual acuity was 20/20, depth of field with spectacles, CL, spherical IOL and aspheric IOL were 0.40, 0.85, 0.55 and 0.30D, respectively. When entrance pupil size was around 1.5mm, depth of field had maximum value. When entrance pupil size was larger than 1.5mm, depth of field decreased, the value with aspheric IOL becoming half that with spherical IOL.

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  • Keiji Uchikawa, Natsuko Okiyama
    Type: ORIGINAL ARTICLES
    2010 Volume 31 Issue 3 Pages 114-119
    Published: 2010
    Released: November 08, 2019
    JOURNALS FREE ACCESS

    Previous studies have shown that visual attention either facilitates or inhibits the higher-level processes of visual information. However, it is not clear whether visual attention modulates the early level processes of the visual system. The present study aims at revealing whether visual attention independently affects luminance and chromatic channels, which are assumed to be in the early level of the visual system. In experiments, we measured the contrast detection sensitivities of chromatic and luminance responses to foveal stimulus and peripheral stimulus in the dual task paradigm, and observed whether the contrast sensitivity of the luminance and chromatic channels varied in a different manner between central priority and peripheral priority conditions. We found that visual attention increased contrast sensitivity in the chromatic and luminance channels, but in the same way between different priority conditions. Results were not sufficient to reveal whether visual attention independently affected the luminance and chromatic channels, but suggested that the temporal condition of stimulus presentation should be considered, to observe the effects of attention on the early level processes of the visual system.

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