What does lens equilibration refer to?

Lens equilibration specifically involves the lens reaching the same temperature as the tear film. This process is crucial for ensuring comfort and optimal performance of contact lenses on the eye. When a contact lens is first placed on the eye, there can be a difference in temperature between the lens and the surrounding tear film. Over time, the lens warms up to match the temperature of the eye’s tear film, which can enhance the wearing experience by reducing discomfort and promoting a stable tear film layer over the lens surface.

The other options do not accurately describe lens equilibration. Aligning with the eye's curvature is related to how well the lens fits on the eye, whereas becoming more hydrophilic pertains to changes in the lens material properties, not directly to temperature. The process of inserting a contact lens is an entirely separate action related to lens application rather than its equilibration with the eye.