What effect does a longer radius of curvature have on a contact lens?

A longer radius of curvature in a contact lens design means that the lens shape is less steep and, therefore, flatter. The radius of curvature refers to the curvature of the lens surface; a larger radius indicates a gentler curve. When the curvature is flatter, it effectively changes how the lens conforms to the eye's surface. This is important for creating a comfortable fit and ensuring that the lens can work effectively with the shape of the wearer’s cornea.

This modification also influences other characteristics of the lens, such as its fit and the distribution of tears under the lens, impacting overall comfort and vision. It's essential for practitioners to consider the radius of curvature to ensure optimal lens performance and comfort for the wearer.