Which of the following changes would improve a rigid contact lens fit that shows sluggish movement after 1 hour of wear?

Improving the fit of a rigid contact lens that exhibits sluggish movement after one hour of wear can be effectively achieved by reducing the overall diameter of the lens. A lens that fits well should exhibit adequate movement to allow tear exchange and comfort. Sluggish movement often indicates that the lens is too large, leading to excessive lid interaction that can restrict the natural movement of the lens.

By reducing the overall diameter, the lens will fit more securely within the conjunctival sac and align better with the cornea, allowing for more optimal movement and tear exchange. A more appropriate fit will help to ensure that the lens acts as intended, promoting comfort and effectiveness during wear.

This approach addresses the issue by facilitating proper lid-lens interaction, as a smaller diameter allows the lens to respond more naturally to the eyelids' movements, enhancing the overall wear experience.