When assessing a RGP fit, what does fluorescein indicate if there is central pooling?

When fluorescein indicates central pooling during a RGP (rigid gas permeable) lens fit assessment, it suggests that the lens is too steep. Central pooling occurs when there is an insufficient tear exchange beneath the lens due to the lens's excessive curvature relative to the cornea's shape. This results in a trapped layer of tears that doesn't provide proper movement or circulation, which is essential for maintaining corneal health and comfort.

In a well-fitting lens, you would typically want to see a slight amount of fluorescein to confirm adequate tear exchange without excessive pooling. If pooling is present, the lens curvature must be adjusted to achieve a more optimal fit that allows for adequate tear flow and lens movement. The correct response aligns with the understanding that a fit that is too steep can hinder the necessary tear film dynamics under the lens.