Keep doing me to avoid lens dryness. What am I?

Answer: Blink

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Kids, elders and a monster love me, I’m mostly round and brown if you ask me. What am I?
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Light me up for a sprinkle of gold. What am I?
Light me up in backyard gatherings. What am I?
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Lighter than what I am made of. More of me is hidden than seen. What am I?
Lighter than what I'm made of, more of me is hidden than is seen. What am I?
Like a clock, I strike but at no specific time and after this follows a delayed aggressive chime. With my movements, you may say I’m precise as I don’t like to go to the same place twice. What am I?
Like a river I flow, and you’re happy I do in vain. There is no escaping from my course, without causing pain. What am I?
Look at me one way and I weigh a whole lot; turn me around and you’ll see that I am not. What am I?
Look at me. I can bring a smile to your face, a tear to your eye, or even a thought to your mind. But, I can't be seen. What am I?
Makeup for finger tips. What am I?