What type of power change is characteristic of aspheric lens designs?

Aspheric lens designs are characterized by a gradual change in power from the center to the edge. This design aspect allows for more precise control over the curvature of the lens surface, which helps in minimizing optical distortions and aberrations commonly found in traditional spherical lenses. The aspheric shape flattens out towards the periphery, resulting in a decrease in power as you move away from the center.

This design is particularly beneficial for multifocal and progressive lenses, as it provides a smoother transition between different optical zones, enhancing visual clarity and comfort. The gradual decrease in power helps users experience a wider field of view, reduces peripheral distortions, and can improve overall wearability, especially in high prescriptions. Therefore, the correct answer reflects the fundamental aspect of aspheric lenses that distinguishes them from other lens types.