眼鏡とコンタクトレンズによる視力の検討―恒常法を用いて―

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  • Comparison of visual acuity correction between glasses and contact lenses.-Analysis by constant method of psychophysical technique-
  • Analysis by constant method of psychophysical technique
  • 恒常法を用いて

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Purpose: Glasses, hard contact lenses (HCL), and soft contact lenses (SCL) have different characteristics, and vision with each of these forms of refractive correction differs. We investigated the differences and stability of visual acuity with these three kinds of correction by the constant method using a psychophysical technique.<br>Materials and methods: Six eyes (three normal subjects). We used the constant method to estimate the threshold of visual acuity of the three subjects precisely. Visual acuity was measured with a perception probability curve. We showed the optotype in five stages to obtain the perception probability curve, with each stage having 20 presentations. The refractive correction of the subjects was made with glasses, HCL and SCL. Visual acuity for each correction was obtained by making measurements 10 times with each form of refractive correction. The durations of the presentation optotype were 0.5 seconds and 3.0 seconds.<br>Results: Presentation for 0.5 seconds showed refractive correction with HCL to be more unstable than that with glasses and SCL. Presentation for 3.0 seconds showed improvement of refractive correction with HCL and less spread. With SCL there tended to be more spread. For high myopia, refractive correction with glasses was lower than that with HCL and SCL.<br>Conclusions: With short time presentation, the refractive correction with HCL was unstable because of the wide movement of HCL due to blinking. With long time presentation, the refractive correction with SCL tended to spread because of the dry condition of the corneal surface. Even with short time presentation, refractive correction with glasses was stable. However for high myopia, we reconfirmed that refractive correction with glasses was low, because the retinal image with glasses showed a larger reduction effect than that with contact lenses by the constant method.

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