1. Assembling the vital qi of all the yin and yang organs, the eye is the organ in which mental activity is displayed and the constructive and defensive energies perform their functions.
2. When mentally exhausted, one's mind is confused and he finds himself at a complete loss.
3. Since the liver and kidney qi refreshes the eye's pupil, and the heart and the lungs qi replenishes the whites of the eye, the eye is nurtured and
brightened by the vital qi from all the meridians both yin and yang.
4. The eye is controlled by the mind, while the heart rules over consciousness and thinking ability.
5. When the mind is disordered and the qi of the yin and yang meridians is scattered,one beholds terrifying scenes visual hallucinations produced by the mind's disharmony and the confusion of consciousness.
More information, please read Relationship Between Eyes and Heart and Small Intestine.