Japanese Journal of Visual Science
Online ISSN : 2188-0522
Print ISSN : 0916-8273
ISSN-L : 0916-8273
Volume 33 , Issue 3
Showing 1-8 articles out of 8 articles from the selected issue
Preface
Review Articles
Original Articles
  • Fumiatsu Maeda, Yusuke Suzuki, Shogo Fukushima, Kazutaka Kani, Akio Ta ...
    Type: ORIGINAL ARTICLES
    2012 Volume 33 Issue 3 Pages 115-119
    Published: 2012
    Released: November 22, 2019
    JOURNALS FREE ACCESS

    Purpose: To examine the effect of accommodation-inducing monitors on asthenopia during visual display terminal (VDT) work.

    Methods: The objective refraction value and accommodative high frequency component (HFC) of accommodative microfluctuations were measured both before and after 2 hours of VDT work with an accommodation-inducing monitor and a laptop, respectively. Measurements were made on the right eye. The subjects comprised 6 normal healthy volunteers (5 males, 1 female; mean age±standard deviation: 29.5±7.6 years) with no ophthalmological diseases.

    Results: VDT work with the laptop resulted in significantly increased myopia; HFC also showed a significant rise. There was no significant difference in objective refraction value and HFC when subjects used the accommodation-inducing monitor, although the results showed slightly increased hyperopia and decreased HFC.

    Conclusions: The accommodation-inducing monitor inhibited persistent contractions of the ciliary muscle during VDT work. The results suggest that use of the accommodation-inducing monitor can therefore provide protective efficacy for asthenopia during VDT work.

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  • Yosuke Honda
    Type: ORIGINAL ARTICLES
    2012 Volume 33 Issue 3 Pages 120-124
    Published: 2012
    Released: November 22, 2019
    JOURNALS FREE ACCESS

    Purpose: The purpose of this study was to examine whether aniseikonia is influenced by differences in distance measurement.

    Method: Subjects comprised university students with the same refractive power in both eyes with voluntarily participated in this study. Artificial aniseikonia was produced using afocal size lenses of 0%, 2%, and 4%, added in random order before the left eye. The subjects were then asked to observe the new aniseikonia test (NAT) targets located at 50cm and 5m distance. Aniseikonia was measured by the complete up and down method.

    Results: The main effect of difference in distance measurement was statistically significant (p < 0.01). Aniseikonia in the distance was perceived on average to be about 1.5 times larger than that in the near.

    Conclusions: When treating the complaint of headache or asthenopia in the distance, such as in driving, we should not depend only on measurement of aniseikonia in the near.

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