Will chinese herbs make my dark brown eyes change to hazel or just a lighter brown color

To my knowledge, I have never known this happen.

What can affect the colour of your eyes is your diet: if you constantly eat junk food it will reflect in your eyes.

If you eat a well balanced diet, the eyes will show that, giving you a brighter colour and sparkle.

You can buy various products over the counter to brighten your eyes temporarily in the form of eye drops.They are very good, if your eyes are blood shot, or over tired as they make the whites of the eye a bluey / white, making you look very healthy.

You can also buy contact lenses from your optician, that will completely change the colour of your eye: various colours available.

I am not sure of the cost or even if you would want to bother,especially if you don't wear glasses.
However they do seem to be the fashion right now for some people.

Always remember to look after your eyes, be sure you know what product you are using before putting it into your eyes: they are very precious.

The only safe way to change your eye color is by contact lenses. No herb is going to change dark eyes to really light eyes. People with natural eye color are born that way. It is genetics. They picked up the light eye color from someone in their family. There is also surgery to change eyecolor but it is illegal her in the U.S. and lots of people have been having complications.