According to lens property if the distance of image increases or decreases, then the distance of object will also increase or decrease proportionately. But when we increase or decrease the distance between the eye and the object, the image distance in the eye gets never changed. It means the image is always formed at retina. Yes, it is possible if the focal length of the lens can be increased or decreased accordingly. The eye can also change the focal length of its lens due to its accommodation feature. The eye lens is formed with a fibrous that appears as jelly-like material. The contraction and relaxation of the ciliary muscles help the eye increase or decrease the focal length of its lens so that the closer or distant image can be seen clearly.
Source: http://www.tutionteacher.in/what-happens-to-the-image-distance-in-the-eye-when-we-increase-the-distance-of-an-object-from-the-eye/