What technique is employed to correct high riding gas permeable minus lenses?

The technique used to correct high riding gas permeable minus lenses is prism ballast. This method involves adding a wedge or prism to the bottom portion of the lens to help stabilize the lens position on the cornea, thereby preventing it from riding too high. By creating a prismatic effect, the weight distribution of the lens is altered, allowing it to settle more properly in relation to the eye.

In cases where lenses ride high, they can become uncomfortable and may not provide the intended vision correction. Prism ballast effectively manages this issue by encouraging the lens to lower its position, promoting better comfort and a more stable vision correction.

Other options, while potentially related to lens fitting, do not specifically address the concern of high-riding lenses in this context. Choosing prism ballast helps improve the overall fit and performance of the lens, making it the most suitable technique for this situation.