What adjustment should be made to decrease flexure on a rigid gas permeable lens?

To decrease flexure on a rigid gas permeable (RGP) lens, decreasing the sagittal depth is the appropriate adjustment. Flexure refers to the bending or warping of the lens, which can lead to changes in its optical properties and affect vision.

By decreasing the sagittal depth, the lens becomes flatter, which helps to reduce the amount of flexure that occurs during blinking or when pressure is applied to the lens. A flatter lens profile is less prone to bending under normal conditions, thereby maintaining its intended shape and optical efficacy.

In contrast, increasing sagittal depth could exacerbate the flexure issue, making the lens more susceptible to bending. Changing to a different material may alter lens performance characteristics but does not specifically address the flexure issue as effectively as adjusting the sagittal depth. Widening the lens edges might impact overall lens stability and comfort, but it is not a direct solution to reduce flexure. Hence, decreasing sagittal depth is the most effective method to mitigate flexure in RGP lenses.