Our eyes work as a pair. The second eye adds dimension and perspective to what the other eye is seeing. If you had to, you could get along well with only one of your eyes.
Presently, I wear mono-focal contact lenses. One lens helps me see distance and the other helps me see close. My brain reads the data coming from each eye and blends it so that I unconsciously focus clearly on things up close or at a distance.
If I had to lose an eye, I could still see but not with the advantage of two eyes.
Jesus is talking here about exposing yourself and filling yourself with things that cause you to lose your faith. There is an advantage to not seeing something near or far, if it leads you away from God.
This is the advantage of temporary blindness. Blind in one eye by choice—when not seeing is better than seeing.
We know that your eye does not act independent of the other eye. They work cooperatively. What is Jesus saying then?
Perhaps this parallels our own experience. We are touched by God and filled with His light. On the other hand (or the other eye) we are drawn to worship false gods and to be enticed by the lust of the flesh, lust of the eyes and the pride of life.
Jesus calls us to consider imposing restrictions and limits on ourselves. Better one eye and eternal life than two eyes and Hell. You do not have to look at everything everywhere. Sometimes you need less perspective, not more-- less information, not more.