Which component is essential for a contact lens to provide comfort and stability on the eye?

The correct answer highlights the significance of the base curve in relation to the comfort and stability of contact lenses on the eye. The base curve of a contact lens is the curvature of its back surface and is designed to match the curvature of the cornea. A properly fitting base curve ensures that the lens sits correctly on the eye, allowing it to align closely with the cornea while providing a stable fit. This stability is crucial, as it minimizes movement during blinking and provides consistent optical performance, resulting in a more comfortable wearing experience.

When the base curve is too steep or too flat, it can cause discomfort or improper alignment, leading to issues such as lens displacement or inadequate tear exchange underneath the lens. Therefore, selecting the correct base curve is essential to achieve both comfort and stability when fitting contact lenses for patients.