What is the circumference of a contact lens referred to as?

The term associated with the circumference of a contact lens is referred to as diameter. The diameter of a contact lens is a critical measurement that determines the overall width of the lens, which directly influences how the lens fits on the eye. It is typically measured in millimeters and is an essential parameter for ensuring comfort and proper positioning of the lens. A well-chosen diameter helps maintain optimal vision and minimizes eye irritation, making it a key aspect of fitting contact lenses.

In the context of contact lenses, the base curve refers to the curvature of the lens that comes into direct contact with the eye, power denotes the corrective strength of the lens required for vision correction, and axis is related to the orientation of astigmatism correction but does not pertain to the physical size of the lens. Thus, diameter is the correct terminology when discussing the overall circumference of a contact lens.