What does the term "base curve" refer to in contact lenses?

The term "base curve" specifically refers to the curvature of the back surface of the contact lens. This curvature is critical because it determines how well the lens fits the curvature of the wearer's cornea. A proper fit is essential for comfort and effective vision correction, as it affects the lens's alignment on the eye, which is necessary for optimal performance.

When the base curve is appropriate for a patient's eye, it helps maintain stability during eye movements and reduces the likelihood of discomfort or complications. Different individuals have varying corneal shapes, so the base curve is an important measurement that is tailored for each contact lens wearer. Understanding this aspect allows practitioners to provide suitable recommendations for lens fitting based on individual patient needs.