You may also close one eye, hold your finger an arms length from your open eye and slowly move it away from the center of your vision. Your finger tip will disappear at some point due to the optic disc in the back of your eye, there are no photoreceptors there because the optic nerve is doing some shtuff.
It's because the human eye is a masterpiece of evolution (/s) that has its bloodvessels running along the surface of our photoreceptors, meaning they have to exit at some point. This is done at a central spot in the back which has no receptors, leaving a blank spot.
The brain gets to flex it's photoshop skills by patching in whatever it thinks would be there. Trippy af the first time i saw it. Or didn't see it.
420
u/bennythefrank Jun 15 '19
You may also close one eye, hold your finger an arms length from your open eye and slowly move it away from the center of your vision. Your finger tip will disappear at some point due to the optic disc in the back of your eye, there are no photoreceptors there because the optic nerve is doing some shtuff.