We usually call a specie that lack visual organs blind, this is necessary? Evolutionary, is correct?
Please read:
a) http://www.myrmecos.net/2008/11/18/what-does-it-mean-to-be-an-eyeless-ant/
b) https://richarddawkins.net/2013/07/seeing-with-the-ears-can-bats-hear-in-colour-with-polish-translation/