What does it mean when soft contact lenses must equilibrate on the eye?

When soft contact lenses must equilibrate on the eye, it refers to the process where the polymer of the lens needs to reach the same temperature as the tear film. This is important because achieving thermal equilibrium helps to ensure that the lens feels comfortable on the eye, as a significant difference in temperature can lead to discomfort or irritation.

Additionally, when a lens equilibrates properly, it allows for better interaction with the tear film, ensuring that the lens behaves as expected in terms of hydration and oxygen permeability. This is crucial for maintaining ocular health and comfort throughout the wear of the lens.

Understanding this concept is vital for practitioners, as it highlights the importance of proper lens handling and the physiological considerations necessary for successful lens wear.