Also, until relatively recently glasses were uncool and unfashionable. Computer geeks generally pay less attention to such norms and choose function over form,

Also, until relatively recently glasses were uncool and unfashionable. Computer geeks generally pay less attention to such norms and choose function over form, so a geek with marginally poor eyesight would perhaps be more likely to go for glasses than a non-geek, who would survive without for appearance purposes.