Without the eyeball, the optic nerve, and the visual cortex, a randomly mutated incomplete eye would actually be counterproductive to the survival of a species and would therefore be eliminated through the process of natural selection.
Kung walang "eyeball," "optic nerve" at ang "visual cortex," ang hindi inaasahang pagbabago ay magreresulta sa hindi kumpletong mata at sa gayon ay hindi pakikinabangan.