What is the base direction of the prism induced when the customer's PD is greater than the finished eyewear PD?

When the customer's pupillary distance (PD) is greater than the finished eyewear PD, it indicates that there is a mismatch in the alignment of the lenses in relation to the wearer’s eyes. To correct this alignment, a prism with the base direction "out" needs to be induced.

This is because the base of the prism should align with the way the lenses are oriented in relation to the user's eyes. When the PD of the lenses is less than the customer's PD, the eyes are positioned relatively closer together than what the optical center of the lenses requires. To address this issue, the prism must move the optical center outward (away from the nose), which is achieved by inducing a base "out" prism. This helps to ensure that the light entering the lenses aligns correctly with the visual axis of the wearer's eyes, allowing for proper visual acuity and comfort.

In this scenario, it is crucial to understand that the base direction of the prism is directly related to correcting the perceived discrepancy in the alignment between the lenses and the wearer’s natural line of sight.