Which of the following methods is NOT used for stabilizing soft toric contact lenses?

The process of stabilizing soft toric contact lenses is essential for ensuring optimal vision correction and comfort for the wearer. Among the provided methods, "vertex adjustment" is not a stabilization method for soft toric lenses. Instead, vertex adjustment refers to the clinical measurement and adjustment of the lens position relative to the eye's anatomical features. This involves calculating the effective power of a lens based on its position, which is critical for managing how the corrective power of the lens translates to the eye's surface but does not directly help in stabilizing the lens on the eye.

In contrast, methods like prism ballast, double slap off, and peri ballast are specifically designed to enhance the stability of soft toric lenses.

Prism ballast uses a weighted design within the lens to ensure that the heavier portion of the lens rests at the bottom, which helps it maintain a stable position on the eye during blinking.

Double slap-off applies a similar concept of balancing but utilizes two specific zones of design to ensure that the lens rotates to a desired position and stays there.

Peri ballast, on the other hand, involves modifying the periphery of the lens to enhance its fit and stability, preventing rotation and ensuring that the axis of the lens aligns correctly with the eye's