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Updated: Oct 2, 2025

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    A new raytrace method evaluates progressive addition lenses (PALs) incorporating freeform surfaces and gradient index (GRIN) materials. This advanced optical analysis reveals performance deviations at lens edges, paving the way for improved PAL designs.

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    Area of Science:

    • Optics and Photonics
    • Ophthalmic Optics
    • Materials Science

    Background:

    • Progressive addition lenses (PALs) are crucial for correcting presbyopia.
    • Current evaluation methods for freeform PALs often rely on surface-geometric approximations.
    • Incorporating gradient index (GRIN) materials offers potential for enhanced PAL performance.

    Purpose of the Study:

    • To present a novel raytrace evaluation method for PAL designs.
    • To assess the impact of freeform surfaces and GRIN on PAL optical performance.
    • To compare raytrace evaluations with traditional surface-geometric methods.

    Main Methods:

    • Development of a raytrace evaluation technique for PALs.
    • Validation using analytically generated PAL designs with freeform surfaces and GRIN.
    • Comparison of raytrace results against surface-geometric evaluations and analytic predictions.

    Main Results:

    • The raytrace method shows agreement with analytic and surface-geometric evaluations near the lens center.
    • Deviations observed at the lens periphery are attributed to ray obliquity and combined surface/GRIN effects.
    • The model accurately incorporates physical factors like pupil diameter and eye position.

    Conclusions:

    • The presented raytrace method provides a more comprehensive evaluation of PALs.
    • It enables the assessment of optical contributions beyond polished surfaces and homogeneous materials.
    • This facilitates further research into gradient index materials for advanced PAL development.