Progressive Ophthalmic Lens Reference Axis Optimization

The patent applies local quality by differentiating the optimization criteria for different zones of the lens. The central zone is optimized for sharpness and comfort with larger dimensions, while the peripheral zone is optimized for reduced gradients and improved dynamic vision. This is achieved through zone-dependent optimization functions that assign different weights to optical criteria in different spatial regions, allowing each zone to have tailored properties suited to its functional requirements.

The patent employs parameter changes by dynamically adjusting the optimization parameters based on the spatial zone being optimized. The optimization function uses position-dependent weighting factors that change the relative importance of different optical criteria (sharpness, distortion, gradients) depending on whether the current point is in the central or peripheral zone. This allows the system to achieve both large central zones and limited peripheral gradients through coordinated parameter adjustment across different regions.

The patent resolves this contradiction by introducing a spatial dimension to the optimization process. Instead of uniformly minimizing optical defects across the entire lens, the optimization function evaluates sharpness, distortion, and other criteria at each spatial point independently with position-dependent weighting. This multi-dimensional optimization approach allows the lens to achieve high sharpness in the central zone where it is most critical for reading, while tolerating higher distortion in peripheral regions where it has less impact on visual comfort.