Ophthalmic Lens Optimization for Peripheral Defocus

The patent applies local quality by differentiating the optical properties across different zones of the lens. The central zone maintains standard myopic correction while the peripheral zones are designed with positive power to reduce peripheral hyperopic defocus. This is achieved through the optimization process that modifies the rear surface geometry to create varying optical powers in different regions, allowing the lens to simultaneously correct central vision and reduce peripheral defocus.

The patent employs parameter changes by systematically varying the base curve and surface geometry parameters during the optimization process. The algorithm iteratively adjusts parameters such as the rear surface curvature, aspheric coefficients, and base curve values to minimize peripheral defocus while maintaining central correction. This transforms the lens design from a fixed parameter approach to a dynamically optimized parameter set that balances multiple optical requirements.

The patent applies dynamics through the iterative optimization process that dynamically adjusts lens parameters based on performance feedback. The optimization algorithm continuously evaluates peripheral defocus values and modifies the rear surface geometry in successive iterations. This dynamic approach allows the design to converge toward an optimal configuration that reduces peripheral defocus while maintaining acceptable central optical performance, rather than using a static design compromise.

The patent implements feedback through the optimization loop that calculates peripheral defocus values at each iteration and uses this information to guide further parameter adjustments. The algorithm monitors performance metrics (peripheral defocus, central power, astigmatism) and feeds this information back into the design modification process. This feedback mechanism ensures that changes to reduce peripheral defocus do not excessively degrade central vision correction.