Changes

'''Phase 10:''' This implant sits at the base of the brain, and provides hormonal and genetic stimuli which enable a Marine's eyes to respond to optic-therapy. This in turn allows the Apothecaries to make adjustments to the growth patterns of the eye and the light-receptive retinal cells - the result being that Space Marines have far superior vision to normal humans, and can see in low-light conditions almost as well as in daylight.{{Fn|1}}{{Fn|2a}}{{Fn|3}} The enhanced eyesight also allows Space Marines to clearly see targets at a distance of a couple of kilometres, making out enemy details with ease.{{Fn|17}}*Known mutations: **[[Salamanders]] can see in at least part of the infrared spectrum.