3 Ways To Dilate Or Shrink Your Pupils On Command

With these techniques, you won’t be able to observe your own eyes, so you’ll need to record yourself or have a friend watch.

Some recreational drugs cause dilated pupils as well. These are illegal in most areas, and can come with additional health risks if combined with other substances that cause dilated or constricted pupils.

While light bulbs will work as well, natural light is more effective. Never look directly at the sun, as this could damage your eyes.

Opiates constrict pupils, but most examples are illegal in most countries. They can also cause serious harm, especially when combined with other drugs that cause pupil constriction or dilation.