Love blurs your vision; but after it recedes, you can see more clearly than ever. It's like the tide going out, revealing whatever's been thrown away and sunk: broken bottles, old gloves, rusting pop cans, nibbled fishbodies, bones. This is the kind of thing you see if you sit in the darkness with open eyes, not knowing the future.

The quote is saying that when we are in love, it can be difficult to view the situation clearly. We become more focused on the person we love, and it can be like our vision is blurred. But when love ends or fades away, we can see the situation much more clearly, better understanding the situation and the consequences that may arise. This can be like when the tide goes out, and we find objects that have been washed up, or thrown away or sunk. If we can face our new reality, uncertain of what is to come, we can open our eyes and come to understand things better.