Diffuse central punctate staining indicates the lens fit is likely:

Diffuse central punctate staining is a sign that can indicate how well a contact lens is fitting on the cornea. This type of staining is often associated with a lens that is too tight. When a contact lens fits too tightly, it can restrict the natural movement of the tear film beneath the lens, leading to a lack of adequate oxygen supply to the corneal cells. As a result, the cornea may become irritated and develop small punctate staining, which can appear as diffuse spots on the central part of the cornea during a fluorescein evaluation.

This staining pattern means that the contact lens is compromising the health of the corneal epithelium. Close monitoring and adjustments to the lens fit can alleviate the discomfort and prevent potential complications associated with excessive tightness. Adjusting the base curve or selecting a different lens design altogether may be necessary to achieve a proper fit that supports ocular health.