The human eye has over 100,000,000 rods. These parts of your eye generally help you with your peripheral and night vision. They help you see in the dark. That's over 100 million of them! All working so that when there is little light, you can still see what is there, rather than the darkness itself.
What are you choosing to look at today?
This is a dark world, but light came to this world that we might see. This is a spiritual truth, as well as physical one.