Please read my post before commenting.
I’ve heard the elbow thing and the “what do you see behind you” thing a hundred times.
My thought process is that the optic nerve is essentially an HDMI cable. Whether it is connected to a computer that is turned off (a closed eye, if you will) or just completely disconnected (suppose you are missing an eye or something), the signal it sends to the monitor is the same: nothing.
The “monitor”, the visual cortex, as far as I understand, just constantly processes what the optic nerve sends. So if blind people don’t lack a visual cortex, and the signal that cortex receives from the optic nerve is identical to that of a regular person seeing zero light (assume closing your eyes means 0 light, disregarding light seeping through eyelids and whatnot), how can you say that blind people see nothing while we see black?
In: Biology
Our eyes have a spot in which there are no receptors which causes a blind spot in our vision.
Search on google how to check for blind spot. But basically take your left and right ring finger 30cm away from your face so the tip of the fingers is on the level of your eye, close your left eye while with the right eye focusing on the left finger. Now move your right finger slowly to the right. At some point your finger is going to disappear. That spot where it disappears isnt black.. it just doesnt exist and your finger disappears.. its nothing.
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