They're small-very small. Inside the cornea, they're practically invisible-and they cannot be felt. Intacs corneal ring segments are the result of nearly a decade of clinical research and have been available in other countries for several years. Intacs gently change the shape of your cornea to correct your vision. In the nearsighted eye, the curve of the cornea is too steep.
Light rays entering the eye are bent too much and are focused improperly.
As a result, things far away appear blurry. Intacs change the shape of the cornea, allowing the light rays to focus correctly. But unlike laser surgery, which reshapes the cornea by removing tissue from the center, Intacs are placed in the outer edge-leaving the central cornea intact. Virtually all light that enters your eye passes through the central cornea in order to be focused. For this reason, the central cornea is crucial to crisp, clear vision.