The third chakra is the seat of digestion.  Many chemicals are needed to transform food into nutrients the body can use so this is the seat of fire and alchemy. The first goal is to understanding how each body functions, who has more activity in one chakra and less perhaps in another. Then, we seek to strengthen what is weak and sometimes pacify what is too strong. Fire is inseparable from light so far away as the eyes are from this chakra, whatever we do to improve the management of fire also tends to affect vision in a positive way. Finally, this is where certain types of purification and transmutation take place, where we learn to set our sights on goals and strengthen our resolve.