Focus

Focus has several meanings:

• In optics, focus means that an image is correctly rendered on a plane. This involves the focal length of specific lenses.

• In psychology, focus as a cognitive process means concentrating selectively on a single aspect of one's environment or thoughts while ignoring other things

• In geology, a focus is a point along a fault where an earthquake begins (hypocenter versus epicenter.

• In Buddhist meditation, focus means concentrating the mind selectively on a single aspect of one's thoughts or images while letting go of all other things until the mind become "single-pointed" ("samadhi") through relaxed focused awareness ("shamatha"). According to Buddhism, focus is related to the "fire element" of the mind and nervous system.