Cat-eye glasses were born in the 1930s (though they had yet to labeled as such). Altina Schinasi, the inventor of the popular frame, explains in her documentary Altina how she first came to the idea.
Image source: Parade
Schinasi had noticed how boring all glasses were as if most frames hadn’t improved from the time of Benjamin Franklin. She asked herself, “What would look good on a face?” Her answer: a Harlequin mask. And so the “Harlequin glasses” were born.