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K Negishi, K Kobayashi, M Shibutani, G Takeuchi, K Ohnuma, N Hirayama, K Ohno, T Noda; Comparison of the Visual Function in Eyes with a Monofocal with a Multifocal Contact Lens Using a New Point Spread Function Analysis System . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2012.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To evaluate the visual function in eyes with a monofocal or a multifocal contact lens (CL) using a new point spread function analysis system (PSFAS), and to compare them with the results of a subjective visual function test such as visual acuity. Methods:Single-pass point spread functions (PSFs) at various defocus positions (0 to -4, 0.25 diopter [D] each) were obtained using a new PSFAS in eyes with a monofocal (One day Acuvue, Johnson & Johnson, USA) or a multifocal CL with 2.5 D of additional power for near vision (Focus Progressive, Ciba Vision, USA). The retinal image of Landolt's ring was simulated from PSF by the convolution of the original one with 100% contrast, and the contrast of the gap in the simulated Landolt's ring was obtained in the eyes with the CLs at each defocus position. The visual acuity (VA) in the same subject was also subjectively measured at each defocus position. The characteristics of the change in contrast of the simulated retinal image with defocusing were compared with that of the clinically measured VA with defocusing. Results:In the eye with the monofocal CL, the contrast calculated from PSF was the highest at 0 D then declined with defocusing. The PSF could not be detected with defocusing at about -2.25 D. The change was similar to that of the VA. In the eye with the multifocal CL, there were two peaks in the change of contrast and in the VA with defocusing. The amount of defocus was 0 D at the higher peak and about -2.25 D at the lower peak. The defocus amounts of each contrast peak were similar to those of the clinically measured VA. The contrast value of the higher peak at 0 D in the eye with the multifocal CL was about 50% of that in the eye with the monofocal CL. Conclusion:The visual function in eyes with a monofocal or a multifocal CL can be objectively evaluated from a single-pass PSFs obtained by PSFAS and the characteristics are similar to those evaluated by subjectively measured VA.
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