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Related Experiment Video

Updated: Aug 17, 2025

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
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Surface astigmatism correction using segmented freeform surfaces for a progressive addition lens.

Risheng Xia, Yaoyao Fu, Ke Ma

    Optics Express
    |December 16, 2022
    PubMed
    Summary

    This study introduces a segmented freeform surface (SFS) method for progressive addition lenses (PALs) to correct surface astigmatism. The SFS-PAL design offers improved image quality and enables mass production.

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    Area of Science:

    • Optics and Photonics
    • Ophthalmic Lens Design
    • Surface Metrology

    Background:

    • Progressive addition lenses (PALs) face challenges with irregular surface astigmatism (SA) on freeform surfaces.
    • Existing freeform PAL designs struggle to adequately manage SA distribution, impacting visual performance.

    Purpose of the Study:

    • To propose and validate a novel segmented freeform surface (SFS) construction method for PALs.
    • To correct surface astigmatism (SA) by eliminating the difference between principal curvatures.
    • To enhance image quality in the dynamic field of view of PALs.

    Main Methods:

    • Developed a segmented freeform surface (SFS) construction method utilizing lines of curvature for segmentation.
    • Employed ray tracing and numerical simulations to evaluate optical performance.
    • Utilized diamond turning with fast tool servo for rapid prototyping.
    • Applied injection molding for mass production feasibility.

    Main Results:

    • The SFS-PAL design demonstrated superior image quality compared to conventional freeform PALs within a dynamic field of view.
    • Numerical simulations confirmed the effectiveness of the SFS method in correcting SA.
    • Successful rapid prototyping and mass production pathways were established.

    Conclusions:

    • The proposed SFS construction method effectively corrects surface astigmatism in PALs.
    • SFS-PALs offer enhanced visual performance and are suitable for mass production.
    • This innovation advances freeform lens design and manufacturing for improved ophthalmic optics.