Water element is related to the taste, or tongue. There is saliva in our mouth, due to this we are able to taste something. So water element is related to taste.
The fire element is related to light or eyes. If someone is having eye problems it is related to the stomach. Stomach suffers and so the eyes suffer. Indigestion affects the eyes. So you will observe that before getting spectacles there is surely some indigestion or some stomach related ailment. This is because the stomach is related to the fire element.