A rigid lens showing apical pooling is typically an indication of what type of fit?

Apical pooling occurs when there is a discrepancy between the curvature of the contact lens and that of the cornea, specifically when the lens is fitting too steeply. In a steep fit, the central portion of the lens hugs the cornea tightly, leaving a small air space at the apex of the cornea where tears can accumulate, resulting in pooling. This phenomenon can be visually observed during a fitting exam, often using fluorescein dye to highlight the areas of pooling.

In contrast, an alignment fit would mean that the lens is properly contoured to the surface of the cornea, promoting even distribution of tears and minimal pooling. A flat fit occurs when the lens is too flat for the cornea, leading to inadequate centration and potentially excessive movement of the lens, which would not cause apical pooling. Astigmatic fits are more related to toric lenses designed to correct certain types of astigmatism, focusing on the lens geometry rather than the pooling effect.

Hence, recognizing that apical pooling is indicative of a steep fit helps practitioners understand the relationship between lens curvature and corneal topography, essential for achieving optimal vision and comfort for contact lens wearers.