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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: Jun 10, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Modeling diffraction efficiency effects when designing hybrid diffractive lens systems.

C Londoño, P P Clark

    Applied Optics
    |August 20, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Hybrid optical systems using kinoforms offer broadband achromatization. While improving high-frequency performance, diffraction effects reduce modulation transfer functions at low frequencies.

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    Area of Science:

    • Optics
    • Optical Engineering
    • Diffractive Optics

    Background:

    • Hybrid diffractive-refractive optical systems combine refractive and diffractive elements.
    • Kinoforms, a type of diffractive optical element, exhibit large negative dispersion, enabling achromatization.
    • Achieving high efficiency in diffractive optics is typically limited to specific object points and wavelengths.

    Purpose of the Study:

    • To investigate the design and performance of broadband hybrid diffractive-refractive optical systems.
    • To evaluate the achromatization capabilities of kinoforms in landscape lenses and Schmidt telescopes.
    • To assess the polychromatic image quality considering diffraction efficiency.

    Main Methods:

    • Designed hybrid diffractive-refractive systems (landscape lens, Schmidt telescope).
    • Utilized kinoforms for achromatization due to their large negative dispersion.
    • Calculated modulation transfer functions (MTFs) by constructing weighted geometric point-spread functions from diffracted orders.

    Main Results:

    • The hybrid achromats demonstrated improved MTFs at high spatial frequencies.
    • Diffraction into nondesign orders reduced MTFs at low spatial frequencies.
    • Polychromatic image quality was evaluated accounting for diffraction efficiency.

    Conclusions:

    • Hybrid kinoform-based systems can achieve broadband achromatization.
    • Diffraction effects in kinoforms impact polychromatic image quality, particularly at lower spatial frequencies.
    • The design trade-offs involve balancing achromatization with diffraction efficiency for optimal system performance.