How can the performance of an A-8.50 gas permeable lens be improved for better lid attachment?

Decreasing edge thickness is beneficial for improving the performance of an A-8.50 gas permeable lens in terms of better lid attachment. A thinner edge helps to reduce friction on the eyelid, which allows the lids to glide more smoothly over the lens during blinking. This can lead to a more stable lens position and greater comfort for the wearer.

When the edge of the lens is too thick, it can create a sensation of foreign body presence, leading to increased blinking and movement of the lens. A thicker edge may also hinder the tear exchange underneath the lens, which can negatively impact overall comfort and vision quality. By opting for a thinner edge, these potential issues are mitigated, resulting in improved lid attachment and a more comfortable experience for the user.

The other options, while they may have their own merits in different contexts, do not specifically enhance lid attachment in the same way that decreasing the edge thickness does. For instance, increasing edge thickness could lead to discomfort, while changing the diameter may not directly address the interaction between the lid and the lens. Adjusting the base curve fundamentally alters how the lens fits on the cornea, which may not necessarily correlate with improved lid interaction.