What is the purpose of using fluorescein dye during fitting?

Using fluorescein dye during the fitting of contact lenses is primarily for assessing the tear film stability and the way the lens fits on the eye. When fluorescein is applied, it allows the practitioner to visualize the formation of the tear film, indicating whether it is stable or has any irregularities. This is essential because a stable tear film ensures that the lens will maintain its position on the eye, providing optimal comfort and vision for the wearer.

Additionally, the fluorescein helps in observing the interaction between the contact lens and the cornea, identifying any areas of excessive pressure or misalignment. These assessments are crucial in providing a proper lens fit, which contributes to the overall health of the cornea and comfort of the patient. The importance of a well-fitting lens cannot be overstated, as it affects not only comfort but also the quality of vision and the prevention of potential complications.