(a) The retina acts as a bridge connecting the external environment and visual system components from the anterior optic segment to the visual cortex. (b) The retina will extend to the decompensation stage while experiencing long-term deprivation, accompanied with the anterior optic segment and visual cortex undergoing fluctuating changes, thus leading to irreversible vision impairment. (c) The retina accompanied with other visual system parts, has a latent thickening tendency during initial stage blindness to functionally compensate for the insufficient visual stimulations. As soon as the external signals reach the retina and visual system successfully (after surgery), the compensation disappeared and returned to the normal developmental tendency.