What type of ametropia frequently results in high riding rigid lenses?

High myopia frequently results in high riding rigid lenses due to the unique characteristics of the eye's shape in individuals with this condition. High myopia, or severe nearsightedness, is typically associated with an elongated axial length of the eyeball. This elongation can cause the cornea to sit in a more anterior position relative to the lens, often leading to greater than average minus power requirements in corrective lenses.

When fitting rigid gas permeable (RGP) contact lenses for patients with high myopia, it is common for the lenses to ride higher on the cornea. This happens because a more significant degree of myopia requires curvature and lens design that may not conform as closely to the eye's anatomical structure, particularly if the cornea is flatter or has a different topographical profile. As a result, rigid lenses may not adequately align with the cornea's positioning, leading to a higher fit.

In contrast, conditions like low myopia, hyperopia, or astigmatism may not produce the same degree of axial elongation or corneal distortion, allowing for more stable and appropriately positioned rigid lenses. This distinction highlights why high myopia is specifically noted for causing high riding lenses compared to other ametropic conditions.