I have really sensitive eyes. I was leary about using this product. I wanted red, but it was sold out and red coloring really bothers my eyes, so I went with the black.
I had to try it as soon as it was delivered.
Total trial by error.
You learn super fast how much is too much.
Start small and add. Go big or go home does not apply here.
I was pleasantly surprised that it did not sting.
The more you put in or repeat the application you do get a slight sting.
It does not effect vision after it was settled in your eye. At first, depending how much you use it will make it hard to see. That goes away pretty fast though.
Super easy to use once you practice a few times.
The only con
It will stain your face and surfaces blue.
I have slight eyelid irritation, but I do have sensitive skin and for me, it's not that major.