no it is not true
The gender is irrelavent, it has to do with genetics. Also, blue eyes see better at night, and brown eyes see darker in the day.
Darker eyes are better
You can only see that car's headlights since you are just focusing your eyes in it not in the entire car. Your eyes adjust to the light by using an 'iris'. When bright light is shone into your eyes, the iris shuts down to protect your eyes. The surrounding area, especially behind the light, is many times darker. Because your eyes have shut down the light, there is not enough light entering your eyes to see the darker areas.
No.
no
A soft grey eyeshadow, or if you have brown eyes a pale brown or gold, will make your eyes appear darker.
yes it is better when you see with two eyes then one because when you cover your eye with your hand you dont see that clearly as when you two eyes
not necessaryly. The more melatonin you've got in your eyes, the darker is its color. Now, with dark eyes you're best prepared for locations where the sun is shining bright, cause there won't pass as much light to your retina as if you had blue eyes. On the other hand, people with blue eyes have an advantage in areas with dim light, because their iris lets more ligth through and so they may be ready to see light where people with darker eyes still can't do so. In short: In Africa people profit from brown eyes wheras people in Skandinavia do so with blue eyes.
to see better
No.
CARROTS!
so they can see better