Gingy Technology Inc.

Ast Products, Inc.

Yi-Feng Chiu

Jen-Chieh Wu

Chiung-Han Wang

Wen-Chu Tseng

Chuan-Hui Yang

A double-sided aspheric diffractive multifocal lens and methods of manufacturing and design of such lenses in the field of ophthalmology. The lens can include an optic comprising an aspheric anterior surface and an aspheric posterior surface. On one of the two surfaces a plurality of concentric diffractive multifocal zones can be designed. The other surface can include a toric component. The double-sided aspheric surface design results in improvement of the modulation transfer function (MTF) of the lens-eye combination by aberration reduction and vision contrast enhancement as compared to one-sided aspheric lens. The surface having a plurality of concentric diffractive multifocal zones produces a near focus, an intermediate focus, and a distance focus.

Double-sided aspheric diffractive multifocal lens, manufacture, and uses thereof

An image capturing apparatus including a cover plate, a first lens element and a second lens element arranged sequentially from an object side to an image side along an optical axis is provided. The number of lens elements in the image capturing apparatus is only two. The image capturing apparatus satisfies: 0.2&#x3c;f/imgH&#x3c;0.9, 2.9&#x3c;N1+N2&#x3c;3.7, and 2&#x3c;(OTL&#x2212;d)/imgH&#x3c;8, wherein f is an effective focal length of the image capturing apparatus, imgH is a maximum imaging height of the image capturing apparatus, N1 is a refractive index of the first lens element, N2 is a refractive index of the second lens element, OTL is a distance from a tested object to an imaging plane on the optical axis, and d is a thickness of the cover plate.

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Hsinchu, Taiwan

Yi-Feng Chiu