Quote Originally Posted by jay42
My eyes don't usually get too red, but sometimes I use a little Visine just to be safe and my eyes are more comfortable and less irritated. Sometimes I feel like my eyes are way more dilated and glassy after using it though, and it's far more obvious than before. Anyone else or is it just me? BTW, what's actually in visine?
The active ingredient in Visine is tetrahydrozoline. It is a vasoconstrictor so it hides the red blood vessels in your eyeballs that make them red. Clear eyes and most of the other ones use vasoconstrictors from this same family of drugs but not necessarily tetrahydrozoline. Clear eyes uses naphazoline. Rohto has one eye drop that uses tetrahydrozoline and one that uses naphazoline. Like I said, they all come from the same family of drugs but slightly different. One may work better for one person and one may work better for another person. If you use too much, that can cause a "rebound" effect and have the opposite effect. I have seen people just jam the bottle in the corner of their eye and squeeze it till there is a river flowing out of their eye.

It is very rare for your eye to dilate from Visine. If it is try another product.