What might cause an RGP wearer to complain of blurred vision at near?

When a rigid gas permeable (RGP) lens rides too high on the eye, it can result in blurred vision at near. This positioning can interfere with the lens alignment relative to the corneal curvature and the pupil's location. When a lens is positioned too high, particularly in relation to the center of the pupil, it may disrupt the optimal optical zone needed for clear vision, especially for reading or other near tasks.

In contrast, if the lens is too thick, it might create discomfort rather than causing blurred vision. A lens that rides too low may actually provide clearer vision at near because it could align better with the pupil's center. A curvature mismatch can lead to discomfort rather than blurred vision, as it primarily affects the lens fit and not its positioning. Therefore, the scenario where the lens rides too high is the most likely explanation for the complaint of blurred vision at near for an RGP wearer.