Have seen a ophthalmologist (twice) in last two years, am 23 years old - no conditions/no drugs/nothing.
This is going to sound very weird, maybe I'm being hyper-hyper-aware, I have had visual test done so I know it's not related. So my question...
If I look straight and quickly flick my finger into my temporal peripheral vision, I 'swear' I can quickly see the mirror-image of the same movement occur in my nasal side, as if the image was being picked up from there. Same as if I close one eye, and move my finger in from the nasal side into my vision, I swear to god I quickly see the same movement in my temporal vision, as if my eye(s) are thinking light went off in that area.