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A. Suzaki, T. Kuroda, S. Ninomiya, N. Maeda, T. Fujikado; Higher-order Wavefront Aberrations Induced by Bifocal Rigid Gas-permeable Contact Lens . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3697.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: With bifocal contact lenses (BFCLs), near visual acuity improves while the contrast sensitivity decreases compared with monofocal contact lenses (MFCLs) in presbyopic eyes. However, the optical quality of eyes with BFCL has not been well investigated. The purpose of this study is to investigate higher-order aberrations of the eye while wearing rigid gas-permeable BFCLs with several additional powers (Add) and compared with those by rigid gas-permeable MFCLs. Methods: The subjects included 10 eyes of 5 presbyopic persons. Spherical equivalent refractive errors ranged from –9.25 D to +1.00 D (mean: –4.28 D). Astigmatic values ranged from 0.00 D to –1.50 D (mean: –0.98 D). The rigid gas permeable BFCL (Menifocal® Z, Menicon Co., Ltd., Japan) was designed as alternating concentric configuration with the central optical zone for distant view and the peripheral optical zone for near view. The central and peripheral optical zones were smoothly connected, which allows reducing the blur and the monocular diplopia. We measured the higher-order aberrations with BFCLs (Add: +1.00 D, +1.50 D, +2.00 D) and with MFCL for far vision. Wavefront aberrations were examined with the Hartmann-Shack sensor (KR9000PW, Topcon Corp., Japan) for 4 mm diameter, and the ocular higher-order aberrations (OHA) up to 4th order (RMS error, µm) were calculated. Results: The total OHA with MFCL (0.10±0.01 µm) was significantly lower than that with BFCLs (Add+2.00 D: 0.31±0.03 µm, +1.50 D: 0.30±0.02 µm, +1.00 D: 0.23±0.03 µm) (p<0.01, One Way RM ANOVA). In addition, total OHA with BFCL was higher with higher additional power (+1.5D, +2.0D) compared with lower additional power (+1.0D) (p<0.01, One Way RM ANOVA). Coma-like aberration (3rd order) was significantly higher than spherical-like aberration (4th order) in BFCL with each additional power (p<0.01, One Way RM ANOVA). Conclusions: The total OHA with BFCL was higher than MFCL and increased with the progression of additional power of the lens. The increase of coma-like aberration with BFCL may be due to the decentration of the lens.
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