Is it possible for people to be invisible?

At present, science and technology can not realize the transparent technology of human beings, that is, invisibility.

Generally speaking, invisibility means that the whole body 100% is transparent, allowing light to pass freely without reflection or refraction, so that it is invisible.

But if this is the case, another problem will arise. The human eye structure, lens and retina get images by light entering the pupil. When the two are transparent, the eyes can't capture images, so the invisible man becomes "blind".

So even if science can make the whole body 100% invisible, from a scientific point of view, invisible people can't see anything. If it is an invisibility cloak or something, the principle is basically the same: let the light pass freely without reflection, so that we can't see anything outside.