4 ms·
You can do this, too. To dilate your pupils, defocus your eyes. Let things go as blurry as possible. To constrict again, focus on a small detail in the distance
by dorkwood 5y ago
You can do this, too. To dilate your pupils, defocus your eyes. Let things go as blurry as possible. To constrict again, focus on a small detail in the distance.