Contact lenses are fitted directly over which part of the eye?

Contact lenses are specifically designed to rest directly on the cornea, which is the transparent front part of the eye that covers the iris and pupil. The primary purpose of contact lenses is to correct vision by altering the way light rays enter the eye. Because the cornea is responsible for a significant portion of the eye's focusing power, placing the lens directly on it allows for optimal vision correction.

Fitting contact lenses over the cornea helps ensure that they move slightly with each blink, aligning with the natural movement of the eye. This positioning allows for a stable and comfortable fit, reducing the risk of irritation and maximizing the effectiveness of the lens in correcting refractive errors.

In contrast, the sclera is the white outer layer of the eyeball, while the iris is the colored part of the eye that controls the size of the pupil. The limbus is the border area between the cornea and the sclera. While these structures are important in ocular anatomy, they are not the surfaces on which contact lenses are fitted.