I’m nearly forty and never seen this afore .I was going to sew a button on the granny’s dungarees .Well as usual searched for and finally found a needle and thread .Well as happens it was taking me ages to thread the needle .Here gimme it say granny at 96 she threads it right away . Dumb. Founded but sewed button any way .halfway through the needle came away from the thread it didn’t break but what happened was the head of the needle was just split for easy threading and will hold if not to much pressure is applied when pulling the needle through . Isn’t that fantastic eh .
I'm sixty and use needles that are less than an inch long and so fine a needlethreader would break the eye. They bend and snap with time but I love them for my embroidery. Even for larger items I rarely go above a fine between. I find holding them over a fabric the reverse of the colour I am threading helps.