To steepen the lens-corneal relationship of a gas permeable lens, which adjustments should be made?

Increasing the overall diameter along with increasing the optic zone diameter can effectively steepen the lens-corneal relationship of a gas permeable (GP) lens. When both the overall and optic zone diameters are increased, it provides additional support and stability to the lens on the cornea, allowing for a steeper fit. This adjustment means that the lens will cover a larger area of the cornea, which can help it conform better to the corneal shape and improve lens centration.

This change directly influences how the lens aligns with the natural curvature of the cornea, facilitating a more secure fit and potentially improving vision quality and comfort for the wearer. A properly adjusted lens can also help in managing conditions such as astigmatism and irregular corneas, where an optimized lens-corneal relationship is crucial for enhancing visual acuity.

The other choices, while they might seem plausible in different contexts, do not effectively achieve the goal of steepening that relationship. It is important to remember that the adjustments made to the lenses must support the fundamental principles of fitting GP lenses to ensure both effectiveness and comfort for the wearer.