Gan 
stores Blood, and Shen 
stores vital Essence. Blood and Essence promote, transform, and depend on each other. In TCM research, Shen energy radiates to Gan and they mutually interact with each other.
Deficient Shen -Essence may lead to deficient Blood, manifesting as blurred vision and dizziness. Deficient Gan -Blood may undernourish and weaken Shen -Essence, resulting in dizziness, deafness, nocturnal emissions, and a sore waist.