What aspect of lens design can affect the lens fit on the cornea?

The base curve of a contact lens is a critical aspect of lens design that directly influences how well the lens fits the cornea. The base curve refers to the curvature of the back surface of the lens, which is designed to match the curvature of the cornea. A lens with a base curve that is too steep or too flat compared to the cornea can result in improper fitting, affecting the overall comfort and stability of the lens.

When the base curve is well-matched to the corneal curvature, it helps to ensure that the lens sits properly on the eye without causing pressure points, which could lead to discomfort or adverse effects on the corneal health over time. A properly fitting lens will also ensure optimal visual clarity. Therefore, the base curve plays a pivotal role in achieving a successful contact lens fit, making it the most relevant choice in this context.

The other aspects, while important for different reasons, do not affect the fit on the cornea in the same fundamental way. Diameter influences how much of the cornea the lens covers, weight affects how the lens feels during wear, and color pertains to aesthetic choices but does not impact the physical fitting of the lens on the eye.