What is evaluated using fluorescein when fitting rigid contact lenses?

Fluorescein is a vital tool used in assessing the relationship between the contact lens and the cornea during a fitting process. By instilling fluorescein dye, practitioners can observe the pattern of tear film distribution under the lens to determine how the lens interacts with the corneal surface. This evaluation highlights areas of potential pooling or touch points where the lens may be too tight or too loose, providing insights into the fit and comfort of the lens on the eye.

Analyzing the lens/cornea relationship is crucial for ensuring proper ocular health and comfort, as an improper lens fit can lead to complications such as corneal hypoxia, irritation, or even corneal staining. Therefore, utilizing fluorescein to visualize this relationship helps practitioners make necessary adjustments to the lens parameters for optimal fit and performance.