During a fitting, what is most important to assess to ensure proper lens fit?

The assessment of corneal curvature during a contact lens fitting is crucial for ensuring a proper lens fit. The curvature of the cornea directly influences how a contact lens will sit on the eye. If the curvature of the lens does not match the corneal curvature, it can lead to discomfort, poor vision, or complications such as corneal hypoxia and abrasion.

When evaluating a patient's corneal curvature, practitioners often use keratometry or topography to obtain an accurate measurement. This information is necessary to select a lens that will properly align with the cornea, allowing for optimal comfort and vision correction.

While factors such as lens material, lens diameter, and even the patient's eye color can play a role in the overall fitting process, it is the accurate assessment of corneal curvature that serves as a foundation for choosing the appropriate type and size of lens to ensure effective and safe wear. Thus, understanding the corneal curvature is fundamental to achieving a successful lens fit.