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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)
To investigate the effect of prism correction on objective refraction and pupil diameter.
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.
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).
Prism correction affect pupil diameter at near distance. These results suggest that it is necessary to take care in examination with prism lens.
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