I find this to be true in some sort of way in my Albino Ball Pythons. Never a prob with my Burm. They act strangely to shadows and flinch with delay as if they don't see the moving object itself but maybe its shadow. To some extent I notice this with my BEL too but not even half as much. I thought maybe i was spooking them however i wake them first and also also notice they run into things when out of the enclosure as if they never saw the wall, couch, table etc...
Over the years I've heard about site issues but was never much into Ball Pythons and never noticed this in the Python specie (Albino Burmese) Ive had.
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