A rigid lens showing central vaulting is indicative of what?

A rigid lens showing central vaulting suggests that there is a space or gap between the lens and the cornea at the center, which is characteristic of an apical clearance fit. In this type of fitting, the central portion of the lens has been designed to create a vault above the highest point (the apex) of the cornea, allowing for movement of tears and reducing the risk of lens adherence to the cornea.

This kind of fit is particularly useful for patients with certain corneal conditions or irregularities, as it minimizes contact with the cornea and provides more comfort. Vaulting can enhance the tear exchange under the lens, which is crucial for maintaining ocular health, especially in a rigid gas permeable (RGP) lens design.

Understanding apical clearance fitting is essential for practitioners to provide safe and effective lens fittings, ensuring patient comfort and optimal vision correction.