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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 9, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

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Published on: September 20, 2024

Staircase lens: a binary and diffractive field curvature corrector.

J M Sasian, R A Chipman

    Applied Optics
    |August 31, 2010
    PubMed
    Summary

    Staircase diffractive lenses introduce no optical power but cause field curvature and chromatic aberrations. Testing of a 150-step lens confirmed these optical characteristics.

    Area of Science:

    • Optics
    • Optical Engineering

    Background:

    • Diffractive lenses offer unique optical properties.
    • Staircase lenses are a specific type of diffractive lens design.

    Purpose of the Study:

    • To investigate the optical characteristics of staircase diffractive lenses.
    • To analyze aberrations introduced by these lenses under collimated illumination.

    Main Methods:

    • Theoretical analysis of staircase lens optical properties.
    • Manufacturing of a diamond-turned staircase lens with 150 steps.
    • Experimental testing to verify optical performance.

    Main Results:

    • Staircase lenses introduce no optical power.
    • Fourth-order wave aberrations including Petzval field curvature and chromatic aberrations were identified.

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    Last Updated: Jun 9, 2026

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    Published on: September 20, 2024

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    05:14

    Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

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  • Test results confirmed the generation of field curvature and longitudinal chromatic aberration.

    • Conclusions:

    • Staircase diffractive lenses exhibit predictable aberration characteristics.
    • The study validates the theoretical understanding of these aberrations in staircase lens designs.