Have you ever like looked at a mirror in a dark room then pointed the light towards/so it reflects to your eyes and watch your pupils contract. Its so fascinating. Like i literally spent a whole 10 minutes doing it. Not sure abt if it will affect my eyesight(it's already terrible anyways) but its so cool to watch.
And like when you point the light at the right angle, the colour of your eyes really stand out and it looks so cool in the dark (i found the angle once and i haven't been able to find it since)