The era of hyperbaric oxygen has finally arrived. A high-tech treatment that administers 100 percent oxygen at controlled pressures, forcing healing oxygen deep into tissues, has long been medically approved to treat conditions like bone infection, tissue necrosis caused by serious burns, or carbon monoxide poisoning. But until recently, most hyperbaric chambers were located in hospitals. Now centers are springing up around the country, and here on the East Coast there are treatment facilities available in Manhattan, Brooklyn, Long Island and Maryland. Remarkable responses have been seen in stroke victims, children with cerebral palsy, chronic Lyme disease sufferers, individuals with multiple sclerosis, Crohn’s disease, diabetic complications and many other difficult-to-treat conditions. It is even being used by the rich and famous to help heal plastic surgery scars more quickly.