Japanese Journal of Visual Science
Online ISSN : 2188-0522
Print ISSN : 0916-8273
ISSN-L : 0916-8273
Volume 29 , Issue 2
Showing 1-9 articles out of 9 articles from the selected issue
Review Articles
Original Articles
  • Mariko Maeda, Masahiro Maeda, Eriko Ito, Noriko Mizuguchi, Kazuo Ichik ...
    Type: Original Articles
    2008 Volume 29 Issue 2 Pages 64-66
    Published: 2008
    Released: November 08, 2019

    Purpose: Anterior chamber measuring instruments employing various principles are available today. In this study, we measured central corneal thickness (CCT) and anterior chamber depth (ACD) in normal volunteers, using a recently developed optical measuring system: anterior chamber optical coherence tomography, VisanteTM (Carl Zeiss Meditec). We then considered its measurement accuracy.

    Methods: We measured 24 eyes of 12 subjects (mean age: 31.0±4.3 (23–37) years) with no ocular diseases, but with refractive errors, using VisanteTM and Orbscan®IIz (Bausch&Lomb). Each subject eye was measured five times with the two devices; CCT and ACD data were then compared.

    Results: CCT was 524.6±1.9 μm and ACD was 3.625±0.02 mm, as measured by VisanteTM. In contrast, CCT was 553.5±5.3 μm and ACD was 3.562±0.03 mm, as measured by Orbscan®IIz. This study confirmed high correlation and significant difference between the two devices.

    Conclusions: The observed data confirmed correlation between VisanteTM and Orbscan®IIz; which fact suggests that VisanteTM will be useful in biometric studies of the anterior chamber.

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  • Osamu Katsumi, Maya Sudoh, Emi Ueno, Yu Ogishima, Junko Ito, Yoshitaka ...
    Type: Original Articles
    2008 Volume 29 Issue 2 Pages 67-74
    Published: 2008
    Released: November 08, 2019

    Purpose: To measure contrast visual acuity in contact lens (CL) users.

    Methods: Contrast visual acuity was measured in 15 normal subjects, ranging in age from 25 to 40 years (mean: 28.0 years) and 85 CL users, aged 15 to 51 years (mean: 24.8 years). Of the subjects, 16 used daily disposable soft CL (SCL), 23 used 2-week frequent replacement SCL, 24 used conventional SCL and 22 used rigid gas-permeable (RGP) CL. Contrast visual acuity was measured with the multiple-contrast visual acuity chart developed by Wang and Katsumi, which consists of four parts with different contrast levels 5%, 15%, 90% and 90% with reverse polarity. Contrast visual acuity score was determined by the total number of correct answers.

    Results: In 15 normal subjects, the contrast visual acuity score was 78.6 points. In the CL users, the total score was 73.5 points in the daily disposable SCL group and 70.6 in the 2-week frequent replacement SCL group, lowest among the CL users. In the conventional SCL and RGPCL groups, the score was 73.1 points. Overall, contrast visual acuity showed a decrease compared with normalcy, especially in the low contrast optotypes.

    Conclusions: Measurement of contrast visual acuity is helpful in assessing corneal function, so may be of use preventing CL-related problems.

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