April 2009
Volume 50, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2009
The Effect of Prism Correction on Objective Refraction and Pupil Diameter
Author Affiliations & Notes
  • N. Nakayama
    Ophthalmology & Visual Science, Kitasato Univ Grad Sch of Med Sci, Sagamihara, Japan
  • T. Kawamorita
    Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, Sagamihara, Japan
  • S. Yamamoto
    Ophthalmology & Visual Science, Kitasato Univ Grad Sch of Med Sci, Sagamihara, Japan
  • H. Uozato
    Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, Sagamihara, Japan
  • Footnotes
    Commercial Relationships  N. Nakayama, None; T. Kawamorita, None; S. Yamamoto, None; H. Uozato, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 3984. doi:
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    • Get Citation

      N. Nakayama, T. Kawamorita, S. Yamamoto, H. Uozato; The Effect of Prism Correction on Objective Refraction and Pupil Diameter. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3984.

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

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Abstract

Purpose: : To investigate the effect of prism correction on objective refraction and pupil diameter.

Methods: : Twenty eyes of 12 healthy subjects were included in this study. Mean spherical equivalents were -1.48 ± 2.00 D in left eyes. The measurements were performed with disposable soft contact lens in myopic subjects. Before examination, the eye position evaluated by Alternate Prism Cover Test (mean -5.42±6.50 Δ at far, -10.67±-8.71 Δ at near). Subjects with prism lens corresponding to their angle were measured objective refraction and pupil diameter using WAM-5500 (Grand Seiko Co., Ltd.) at near (30 cm) and far (5 m) distance.

Results: : The pupil diameter with prism lens was 4.68±0.88 mm, which was statistically greater than that without prism lens 4.38±0.71mm at near distance (Wilcoxon test, p < 0.05).There was no statistically significant effect of prism correction on objective refraction (Wilcoxon test, p > 0.05).

Conclusions: : Prism correction affect pupil diameter at near distance. These results suggest that it is necessary to take care in examination with prism lens.

Keywords: pupil • refraction 
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