The persistent vegetative state (PVS) occurs when a patient experiences a coma and then loses cognition. In this state, the patient has no control over their body but is only capable of performing certain involuntary movements. This condition is associated with varying degrees of consciousness. Most PVS patients cannot respond to or perceive external stimuli. The movement or response that they do experience is largely physical, disconnected from the events that caused the physical impulse.


The AN/PVS-31A is a versatile, lightweight binocular night vision goggle designed by L3 in conjunction with USSOCOM. It features a battery pack, articulating housing, manual gain, and incredible tube resolution. Unlike many binoculars, it can be worn under a helmet and does not require a tripod.

The AN/PVS-31A Binocular Night Vision Device is compact and lightweight and replaces the AN/PVS-15. It is the lightest dual tube night vision device currently on the market, weighing less than a pound. The device has the same feature set as other more expensive, bulkier devices. It was specifically designed to improve the overall system resolution, reduce head-borne weight, and provide enhanced operational utility.


The AN/PVS-31 PVS is a lightweight and robust night vision device that is ideal for military and spec ops use. Its unique articulating housing and independently rotating optical pods allow for easy deployment and detachment. Additionally, the device’s low profile minimizes snag hazards.

The AN/PVS-31A is a versatile night vision goggle with an excellent field of view. This gen-three night vision goggle replaces the PVS-15 and is lightweight at 1.69 pounds, including the battery pack. The PVS-31A is available with a monocular or binocular configuration. When used in the binocular configuration, google’s image quality is enhanced to provide a deeper sense of depth and clarity.

The AN/PVS-31A has a unique articulating optical system that is capable of using onboard AA batteries or a remote cold weather battery pack. Its streamlined design allows it to weigh just under a pound. Its features include a manual gain control, individually articulating optical pods, and inter-pupillary distance stops. It also has a high signal-to-noise ratio and a minimum resolution of 72lp/mm. Moreover, it has a maximum halo value of 0.85.

This compact and lightweight binocular night vision device replace the legacy AN/PVS-15. It is the smallest dual-tube night vision device available. It weighs just one pound and has the same feature set as heavier, bulkier models. Moreover, the AN/PVS-31A is designed with the needs of U.S. Special Operations Forces in mind and has been enhanced with their feedback. It has improved the resolution and reduced head-borne weight while providing increased operational utility.

The AN/PVS-31 PVS is the most popular military surveillance radar in the world. It is used by the US Navy, US Air Force, and various nations. Its recurrence and accuracy make it an excellent choice for a wide range of mission types.