Mechanical and fluid system and method for the prevention and control of motion sickness, motion-induced vision sickness, and other variants of spatial disorientation and vertigo

A non-electronic head-worn system for providing visual inertial head orientation information to a person, the system comprising:

• a unit attached to the head of the person;
• an orientation reference symbol in the normal field of view of the person, wherein:
• the symbol is fixedly coupled to movement of the unit whereby the symbol stays in a fixed visual position for the person when the person's head moves;
• the symbol comprises a pitch reference element;
• and
• the symbol comprises a roll reference element;
• a pitch indicator attached to the unit, wherein:
• the pitch indicator moves in response to inertial rotation of the unit about the person's interaural axis
• the pitch indicator is responsive to an inertial device selected from the group of a pendulum attached to the unit, a rolling element retained in the unit, and a fluid in a reservoir in the unit;
• movement of the pitch indicator does not comprise a response from an electro-mechanical sensor from the group of an accelerometer, a gyroscope, an acoustic detector, a magnetic detector, and an optical detector;
• movement of the pitch indicator does not require the use of electricity;
• and
• movement of the pitch indicator occurs in the normal field of view of the person;
• and
• a roll indicator attached to the unit, wherein:
• the roll indicator moves in response to inertial rotation of the unit about the person's naso-occipital axis;
• the roll indicator is responsive to an inertial device selected from the group of a pendulum attached to the unit, a rolling element retained in the unit, and a fluid in a reservoir in the unit;
• movement of the roll indicator does not comprise a response from an electro-mechanical sensor from the group of an accelerometer, a gyroscope, an acoustic detector, a magnetic detector, and an optical detector;
• movement of the roll indicator does not require the use of electricity;
• and
• movement of the roll indicator occurs in the normal field of view of the person;
• whereby:
• the person can view the location and movement of the pitch indicator relative to the pitch reference element;
• and
• the person can view the location and movement of the roll indicator relative to the roll reference element
• to determine orientation of the person's head and thereby minimize a physiological effect selected from the group of vertigo, motion sickness, motion intolerance, and spatial disorientation resulting from sensory mismatch between a person's visual, vestibular, and proprioceptive organs.