Why is it important to avoid apical clearance in soft lens fitting?

In the context of soft lens fitting, avoiding apical clearance is crucial because it can lead to discomfort during wear. When a contact lens has excessive clearance at the apex, or center, it does not make appropriate contact with the cornea. This lack of contact can result in inadequate interaction between the lens and the tear film, potentially leading to feelings of looseness, instability, and discomfort.

Moreover, improper apical clearance can contribute to issues such as lens displacement, where the lens may shift from its proper position on the eye, causing irritation and discomfort. Ensuring that the lens fits snugly without excessive apical clearance supports a more stable fit that corresponds well to the natural shape of the cornea, enhancing overall comfort and wearability.

The other considerations, such as lens movement and comfort, are important factors, but they are directly affected by whether or not the fit includes appropriate apical clearance. Thus, maintaining an optimal fit is essential for ensuring that not only is the lens positioned correctly but that it also remains comfortable and effective for the wearer.