Vergence (optics)

Vergence is the way our eyes move when we focus on something that's close or far away.

When we look at something that's far away, our eyes don't have to do much work. They're pointing straight ahead, and both eyes are looking in the same direction.

But when we look at something up close, our eyes have to work harder. They have to turn inward a little bit, towards each other. This helps us focus on the object, and it's called converging.

Converging means our eyes are moving inwards, towards each other.

Now, if we want to look at something far away again, our eyes have to move back out to look forward again. This is called diverging.

Diverging means our eyes are moving outwards, away from each other.

So, in summary, when we focus on something close up, our eyes converge (move inward towards each other). And when we focus on something far away, our eyes diverge (move outward away from each other). This is how our eyes work together to help us see things clearly.