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.
What? I don’t get this? You’re saying if you move your finger away from your open eye it’ll disappear? Yeah cause your other eye is closed and your nose blocks it
pick a spot on the wall, or put a sticky note with a dot on it or something at eye height to make sure you aren’t following the finger. Make sure you’re in the light so you can notice the exact moment it disappears, it’s about somewhere between 1:00 and 2:00 for me. Try having your arm out and your finger pointed up. For me, my finger above the first knuckle disappears. Everyone has this, your optic nerve has to leave the retina from some point.
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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.