What is the term for when a silicone hydrogel lens is used as a cushion between the cornea and a GP lens?

When a silicone hydrogel lens is used as a cushion between the cornea and a gas permeable (GP) lens, the correct term for this practice is known as piggyback fitting. This method involves placing a soft silicone hydrogel lens directly on the cornea, providing enhanced comfort and a more stable fit when paired with a GP lens.

This technique allows the GP lens to sit securely and comfortably on the corneal surface while minimizing discomfort that some patients may experience wearing hard lenses alone. The cushioning effect of the soft lens helps to create a barrier that can reduce symptoms of dryness and irritation, making it particularly beneficial for patients who may have a sensitive cornea or who are new to GP lens wear.

The other options refer to different fitting techniques that do not involve the use of a cushion or silicone hydrogel lens as described in the question. Understanding these distinctions is crucial for choosing the appropriate fitting strategy for contact lens patients.