When the distance of an object from the eye increases, the image distance inside the eye does not change. The image distance is the fixed distance between the eye lens and the retina, which remains constant. Instead, the eye lens changes its focal length (by adjusting its thickness) through the process of accommodation to keep the image focused on the retina. This adjustment in focal length compensates for the change in object distance, ensuring that the image distance remains constant on the retina regardless of how far the object moves away from the eye.