Which type of corneal astigmatism is GP lenses most indicated for?

GP (gas permeable) lenses are most indicated for irregular astigmatism due to their ability to create a stable optical surface over the cornea. Irregular astigmatism occurs when the curvature of the cornea is not uniform, often resulting from conditions such as keratoconus or corneal scarring.

GP lenses offer several advantages in these cases: they can mask the irregularities in the cornea and provide a more uniform refractive surface, which helps improve visual acuity. Additionally, their rigidity allows them to maintain a shape that compensates for the distorted cornea beneath, enhancing stability and comfort for the patient. Regular astigmatism, while also correctable with GP lenses, presents a more uniform curvature that could be adequately addressed with other types of lenses, making GP lenses less specifically indicated in those instances. Other forms like oblique or simple astigmatism might not exploit the unique benefits of GP lenses in the same way as irregular astigmatism does, particularly in terms of dramatically improving vision through a customized and stable lens design.