Measuring Contrast Acuity in Contact Lens Users

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  • コンタクトレンズ装用者のコントラスト視力

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<p>Purpose: To measure contrast visual acuity in contact lens (CL) users.</p><p>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.</p><p>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.</p><p>Conclusions: Measurement of contrast visual acuity is helpful in assessing corneal function, so may be of use preventing CL-related problems.</p>

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