Question

how can our ayes see even after our death​

Answer 1

Explanation:

For some time now it has been known—as a result of various interesting ophthamological experiments done by certain ingenious scientists, authoritative observers that they are—that the image of exterior objects imprinted upon the retina of the eye are conserved there indefinitely.

Answer 2

Answer:

Well technically, as Sarahn Van Weeren noted in his answer (), in order for the retina to be doing anything meaningful, it has to be connected to a functioning central nervous system. And after “Death”, which we are defining as “brain death” for the purposes of this question, the retina is not doing anything meaningful.

But let’s just pretend that we want to know how long the retinal cells continue to be capable of any maintaining their cellular structure (we would like to be able to assess neural activity, meaningful or not, after the patient is declared dead, but I haven’t found such a study yet). I will also assume that in this scenario artificial respiration and circulation are not being used, as they would be in organ donor patients, and that no attempt to “rescue” the dying retinal cells is being attempted .

So the best available information for this will come from animal studies where the eye was artificially deprived of circulation, and at various time periods, the retinas were examined to see what percentage of cells were dead vs. alive. “Following 30 or 45 min of ischemia, cell loss lasted 14 days and caused the death of 46 or 50%, respectively, of the population of retinal ganglion cells. Sixty, 90 or 120 min of retinal ischemia were followed by a period of cell loss that lasted up to 90 days and caused the death of 75%, 87% or 99%, respectively, of the population of retinal ganglion cells.”

So based on this rat study (rat retinal ganglion cells behave roughly similar to human retinal ganglion cells for most studies) after 45 min of no circulation and rapidly declining oxygen and nutrients, 50% of the cells were dead. After 2 hours, 99% of the cells were dead. This just means that the cells were “dead” in a pathology specimen. They may have ceased neural function well before that