Does having energy constrict or dilate pupils?

This depends on what you mean by energy. A large amount of light energy, say from sunlight, will cause your pupils to constrict. But I'll assume you mean personal energy. In that case it doesn't really have an effect either way. read more

Having energy dialates the pupils just like the effect of adrenaline. It allows to pass on more amount of light into the eyes so that the brain has access to more visual information and is better prepared for the situation at hand, provided the intensity of external light remains unchanged. read more

For example, much energy drinks will result in the dilated pupils. As we all know that the pupil is located in middle of the eye. The color of the pupil is black in color and surrounded by the iris. read more

Active Dilation of the pupils is caused by stimulation of the radial muscles of the iris. The radial muscle is activated by the sympathetic nerves in the iris. The sympathetic nerves release norepinephrine (noradrenaline-NA) which then activates the radial muscles. read more