What does increased edge lift in a lens typically improve?

Increased edge lift in a contact lens generally enhances tear exchange under the lens. This phenomenon occurs when the lens edges are designed to maintain a certain distance from the cornea, allowing for a more substantial flow of tears to enter and exit the space between the lens and the eye.

When there is greater edge lift, it creates a reservoir for tears, which helps to enhance oxygen supply to the cornea and facilitate the removal of metabolic waste. This movement of tears is vital for corneal health, as it contributes to hydration and keeps the cornea clear and free from debris.

While lens rotation, lens stability, and corneal health are important factors in contact lens fitting, they are not directly improved by increased edge lift. Lens stability relates more to how the lens aligns itself with the cornea, lens rotation concerns the orientation of certain lens designs, and corneal health can be indirectly influenced by improved tear exchange but is not the primary function of increased edge lift. Thus, the correct understanding is that increased edge lift directly facilitates better tear exchange, which is crucial for maintaining eye comfort and health.