Dr.Pang said: In the methods of focusing the mind discussed in The Essentials, there are three types: form-based focusing, divine light focusing, and pure mental focusing. Form-based focusing (or internal vision focusing) involves using the eyes to visually focus inwardly on one's own body. Some schools of thought caution that individuals with excessive yang energy who focus on the upper body may risk elevated blood pressure or cerebral hemorrhage. This warning, however, applies specifically to form-based focusing and not to divine light focusing or pure mental focusing.