Why do the pupils dilate at the moment of death?

This is one of the manifestations of brain death, mydriasis light reflex disappeared; Dilated mydriasis, fixed, and indeed as an important test to determine the death of the test content. Specifically speaking, refers to the pupil diameter greater... read more

Shortly after death, due to relaxation of muscles, including the iris, the eyes will dilate (pupils grow larger). However, with the onset of rigor mortis, the pupils constrict. They may be unevenly dilated or constricted, and may even appear oval. read more

Your pupils expand because the iris’ muscle fibers pull the pupil to a neutral size, and because the body’s functions are done, the eyes are unresponsive to light. Therefore, I wouldn’t say that the pupils dilate, just that they rest as the iris uses the last energy to expand them. read more