Jumping spiders ' visual acuity exceeds by a factor of ten that of dragonflies , which have by far the best vision among insects . Human eye are only about five times sharper than a jumping spider 's .
Jumping spiders ' visual acuity exceeds by a factor of ten that of dragonflies , which have by far the best vision among insects ; in fact the human eye is only about five times sharper than a jumping spider 's .