If a contact lens is too loose, which adjustment can be made?

A contact lens that is too loose does not fit snugly against the cornea, which can result in movement and discomfort for the wearer. To address this issue, one effective adjustment is to select a steeper base curve for the lens. A steeper base curve conforms better to the curvature of the cornea, helping to create a better fit and reduce excessive lens movement.

When you increase the curvature of the base, it allows more of the lens to engage with the corneal surface, leading to a more secure fit. This adjustment enhances stability and can also help with comfort and vision clarity, as it minimizes the potential for lens dislodgment during blinking or eye movement.

While other adjustments like decreasing sagittal depth or diameter may also influence lens fit, they do not directly provide the same corrective impact on a lens that is too loose as effectively as a steeper base curve does. The optical zone adjustment mainly focuses on vision correction rather than fit, which is not the primary concern for a loose lens. Therefore, choosing a steeper base curve directly addresses and resolves the problem of a loose fitting contact lens.