STEVE MANN, an engineering professor at the University of Toronto, has lived as a cyborg for more than 20 years, wearing a web of wires, computers and electronic sensors that are designed to augment his memory, enhance his vision and keep tabs on his vital signs. Although his wearable computer system sometimes elicited stares, he never encountered any problems going through the security gates at airports.

Last month that changed. Before boarding a Toronto-bound plane at St. John's International Airport in Newfoundland, Dr. Mann says, he went through a three-day ordeal in which he was ultimately strip-searched and injured by security personnel. During the incident, he said, $56,800 worth of his $500,000 equipment was lost or damaged beyond repair, including the eyeglasses that serve as his display screen.

His lawyer in Toronto, Gary Neinstein, sent letters two weeks ago to Air Canada, the airport and the Canadian transportation authority arguing that they acted negligently and seeking reimbursement for the damaged equipment so that Dr. Mann could put his wearable computer back together again.

The difficulties that Dr. Mann faced seem related to the tightening of security in airports since the terrorist attacks of Sept. 11. But he had flown from Toronto to St. John's two days earlier without a hitch.

On that day, Feb. 16, he said, he followed the routine he has used on previous flights. He told the security guards in Toronto that he had already notified the airline about his equipment. He showed them documentation, some of it signed by his doctor, that described the wires and glasses, which he wears every waking minute as part of his internationally renowned research on wearable computers.

He also asked for permission not to put his computer through the X-ray machine because the device is more sensitive than a laptop. He said that the guards examined his equipment and allowed him to board the flight.

But when he tried to board his return flight on Feb. 18, his experience was entirely different. This time, he said, he was told to turn his computer on and off and put it on the X-ray machine. He took his case to Neil Campbell, Air Canada's customer service manager at the St. John's airport, and spent the next two days arranging conversations between his university colleagues and the airline.

The security guards continued to require that he turn his machine on and off and put it through the X-ray machine while also tugging on his wires and electrodes, he said. Still not satisfied, the guards took him to a private room for a strip-search in which, he said, the electrodes were torn from his skin, causing bleeding, and several pieces of equipment were strewn about the room.

Once his system was turned off, turned on again, X-rayed and dismantled, Dr. Mann passed the security check. When he was finally allowed to go home, some pieces of equipment were not returned to him, he said, and his glasses were put in the plane's baggage compartment although he warned that cold temperatures there could ruin them.

Without a fully functional system, he said, he found it difficult to navigate normally. He said he fell at least twice in the airport, once passing out after hitting his head on what he described as a pile of fire extinguishers in his way. He boarded the plane in a wheelchair.

"I felt dizzy and disoriented and went downhill from there," he said.

Air Canada said that there was no record that any of Dr. Mann's baggage had been lost and that the Canadian transportation agency, Transport Canada, had required that his belongings be X-rayed. "We don't tell the security firms that there is going to be an exception made

If you actually read information on the eyetap [eyetap.org] device, you'll find that the aremac project and image that "appears to be spatially aligned, and appears at with the same focus as the real world scene." In other words (as is written in the AP article), it can make it seem that images are projected onto real-world objects, rather than appearing to be at a fixed distance. I think this minimizes the vision problems that might occur.