Warning. May not be suitable for intolerant minds.
What is personality?
The internal perception of a person is based on the internal Value-system.
The external speech and actions are the outward behavior, also based on the Value-system.
Everything resides in the brain.
In other words, VISION subserves the Value-system. Let me explain.
Without a proper word for higher brain function, I believe early founding fathers of behavioral optometry were at a loss of words to describe VISION in greater details. With modern neuroscience, fMRI, PET scans, etc. and other research work, it becomes very necessary to explain details of the inner workings of the human brain in conjunction with human behavior.