Why do things move when I stare at them?

Oscillopsia is a vision problem in which objects appear to jump, jiggle, or vibrate when they're actually still. The condition stems from a problem with the alignment of your eyes, or with the systems in your brain and inner ears that control your body alignment and balance.

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Thereof, why do i keep seeing a purple light?

It's probably a normal effect. There is kind of local dimming in our retina when being exposed to intensive light. After the local exposure, the respective areas of the retina are less sensitive so they perceive light to be darker and of the opposing color (check any color wheel). Correspondingly, what is it called when you see things out of the corner of your eye? It's called a visual hallucination, and it can seem like your mind is playing tricks on you.

Subsequently, what happens if you don't blink for 30 seconds?

If you don't blink, or don't blink frequently enough: Your cornea can swell. Your cornea doesn't have blood vessels, so it needs oxygen from the tear film, which it gets when you blink. Your risk of eye infection increases due to debris that stays in your eye and a lack of oxygen to the eye. Keeping this in consideration, what happens every time you blink? Every time you blink, a thin layer of tears spreads across the surface of your eyes, preventing them from drying out. Your blink also removes tiny dirt and dust particles. Making a conscious effort to blink during high focus activities can do your eyes a world of good.

How much time do you waste blinking?

You spend about 10 per cent of your waking hours with your eyes shut, simply because of blinking. Every few seconds, each time you blink, your retinas are deprived of visual input for a period lasting anywhere between tens to hundreds of milliseconds (500 milliseconds is equivalent to half a second).