Emmetropia is the ideal state of the eye in which no refractive error is present. The focus of the eye is set for distance vision without the need for glasses or contact lenses. Emmetropia occurs when the curvature of the cornea, the shape of the lens and their distances from each other and the retina are in harmony. The cornea and lens focus the rays of light from an object perfectly on the retina, creating a sharp image.
