So after death, the eyes lose their function, but the retina is actually useful and can be transplanted to other people, just like the energy part of your camera is damaged and can't be used, but the lens can actually be removed and replaced with other similar products to continue to use. It is useless to stay on the original camera. Only by removing it from other cameras can it play its original role.
In general, death can be judged by the eyes. If the pupil is completely dilated, it means death. When forensic doctors or doctors judge life and death, in fact, some links inside will have the process of opening their eyelids to look at the pupils. Now, instead of finding the picture seen by the deceased from the eyes of the deceased, it is to judge whether the deceased died and how long it took.
In fact, when people enter the last moment of their lives, their bodily functions are rapidly disappearing. In the days before death, basically some people can't open their eyes. Even if there is, some people can't see the people and things around them clearly. Basically, they can only hear voices, and it is difficult to see people. Some people say that the eyes of the elderly at this stage have basically lost their function, and only the ears can hear the sound.
After death, the eyes are like a camera without power. The lens will be completely turned off, that is, the function of presenting images will not be realized, and the eyes will be black and completely distracted. The result is a death certificate. Without the support of electricity, the light bulb can't shine and illuminate the surroundings. In fact, the eyes are the same. If you can still have visual function after death, it is also called death. Some people's retinas can be used because they belong to undamaged parts.