In a Freeform PAL lens design, how is the prescription modified?

In a Freeform Progressive Addition Lens (PAL) design, the prescription is modified to a compensated Rx based on specific lens measurements provided. This customization is crucial for achieving optimal visual performance for the individual wearer. Freeform technology allows for individualized adjustments by taking into account various factors such as the wearer's unique eye measurements, frame parameters, and personal visual needs.

The process involves using advanced digital surfacing techniques that create a lens with specific power changes tailored to the user's requirements, rather than relying on standardized prescriptions or averages. As a result, the lens offers improved clarity at all distances and enhanced visual comfort, especially in dynamic viewing situations. This bespoke approach is what differentiates Freeform PALs from traditional lens designs, ensuring that the final product is not only about correcting vision but also about enhancing the overall visual experience. This customization is specifically what makes choice B the correct one.