User blog comment:SanjayBeast/Can someone explain the effects of the patch that has just been released?/@comment-1341687-20120531021218/@comment-4692902-20120601180025

As far as an in universe explanation goes the Geth "head" isn't the most vital part nor, to my knowledge, does it contain the processors or the Geth programs, so it might be like shooting the eyes, they can't see, but I'm sure they have something of radar.