Ortho-Keratology at EITG
Myopia, commonly known as near-sightedness, extends beyond a mere need for glasses. In children and teenagers, myopia tends to progress steadily until late adolescence or early adulthood, leading to increasingly blurred vision, frequent changes in prescriptions, and heightened risks of eye diseases. The term ‘myopia control’ encompasses various approaches aiming to slow down this progression.
There is substantial evidence that supports the effectiveness of myopia control through specialized glasses, contact lenses, and orthokeratology (ortho-k). Ortho-k involves wearing rigid contact lenses overnight, reshaping the cornea to eliminate the need for daytime glasses or lenses. Current research indicates a significant myopia control effect with ortho-k, meaning it slows down myopia progression by half compared to standard vision correction methods.
The exact mechanism behind ortho-k’s myopia control effect is not fully understood. However, the prevalent theory suggests that it alters the way light is focused inside the eye. By gently flattening the cornea, ortho-k modifies its focusing power, bringing light back into focus on the retina. Interestingly, this flattening also creates a unique shape profile, causing peripheral light rays to focus in front of the retina, acting as a potential stop signal for eye growth and slowing down myopia progression.
The cornea, a transparent, dome-shaped window at the eye’s forefront, plays a pivotal role in focusing light onto the retina, being a key factor in the eye’s focusing ability due to its inherent flexibility. When preparing for corrective procedures, your ophthalmologist utilizes a corneal topographer—a non-intrusive instrument—to meticulously map and measure the cornea’s surface. This mapping process involves reflecting light off the eye without any direct contact or pain. The resulting corneal topography map becomes a personalized guide, revealing the unique shape and curves of your cornea, allowing for the design of a tailored lens for optimal vision correction.