No-one can re-implant an entire eye, because the optic nerve has been severed in one who has lost an eye. A cornea can't be grafted to a glass eye. But blindness isn't only caused by loss of the entire orbit. It's also caused by cloudy corneas, which is the purpose of eye-banks.
The optic nerve is a cable of nerve fibers that carry visual information from the eye to the brain. In adult mammals, any damage to the optic nerve caused by injury or disease tends to be permanent, because the cells that form the optic nerve cannot regenerate. Any injury or disease that involves optic nerve damage can lead to permanent loss of vision. Obviously the loss of an eye would sever the optic nerve.
However, if the future holds success for optic nerve regeneration, it would also open the door for entire-eye transplantation. In which case, a new cornea might come in handy.