What is likely to cause blurry near vision when wearing RGP lenses?

Blurry near vision when wearing rigid gas permeable (RGP) lenses can often result from the lens riding too high on the cornea. When the lens is positioned above the intended location on the eye, it can disrupt the optical alignment needed for clear vision, particularly at near distances. This misalignment may lead to a situation where the lens does not provide proper focus, resulting in blur during close-up activities.

An RGP lens is designed to sit in a specific position on the cornea to function optimally—when its position is improper, the way light enters the eye can be adversely affected, leading to a lack of clarity in vision for near tasks. Understanding this positioning is critical in ensuring proper fit and comfort for lens wearers.