Will not damage the visual function of the eyes. But it will have an impact on visual perception, and the eyelids may block some light from entering the eyes. When the nerve is cut off, some functions after the breakpoint will be lost. Only when the nerve grows back, the growth of the nerve is very slow (basically at the speed of mm/ day), so it can only wait slowly. Eating more phosphorus and calcium should have some effect, at least to ensure that the nerve growth rate is maintained in a normal physiological state.