Kowa Company Limited

Yasuhiro Hishinuma

Kotaro Mitsumoto

Norio Shimizu

A multifocal diffractive lens is provided which achieves efficient use of light. The multifocal diffractive lensincludes a diffraction grating. Negative-order light Lproduces a focal point ffor far vision and 0-order light Lproduces a focal point fnearer to that for far vision. The number of focal points is two or more. The focal position fc for far vision in polychromatic performance evaluation is located nearer to the multifocal diffractive lens than the focal position fs for far vision in monochromatic performance evaluation.

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Hamamatsu, Japan

Yasuhiro Hishinuma