Living people are not allowed to donate corneas. Each eye has only one cornea, and all of the cornea will be removed when the cornea is donated, along with part of the sclera or the whole eye. The original closed eye will then become open and the tissue structure inside the eye will be exposed and will flow out. For people who have passed away, the cornea can be donated. For living people, an open eye can cause infection inside the eye, and the refractive system that has the cornea involved in its formation is destroyed, and the eye contents can flow out of the damage, and the whole eye can be said to have no corresponding function, so living people cannot donate corneas.