Question: how does our eyes and brain connected?

Ed Bracey answered on 6 Nov 2017:

Your eyes are actually a part of your brain. Inside your eyeball, at the back, is the retina. That’s part of the eye that detects light. It’s full of little brain cells. Some of the brain cells detect the light, and some of them do little calculations that help you see better. When they’re done calculating, they send electrical messages through other long thing neurons along what’s called the the optic tract and into a part of the brain called the thalamus (that passes the message on) and then on to the visual cortex, which makes sense of the message from your eyes.

Light detected on the right side of your retinas goes to the left side of the brain, light detected on the left side of your retinas goes to the right side of the brain!

If you get damage to the back of your brain, where the visual cortex is, even though your eyes could still detect light, you wouldn’t be able to see anything!