HONOLULU -- The Coast Guard is trying to determine who flashed a green laser at airplanes landing at John Rodgers Field at Kalaeloa twice in the past month.

Distractions during landing could be dangerous, officials said.

"Landing is a precarious operation. The crew is completely focused and procedures need to be exact," said Cmdr. Chris Moss, the operations officer at Air Station Barbers Point. "To be distracted by the laser is dangerous in itself, but the eye damage from the laser can be instantaneous and permanent."

The laser could cause eye damage in less than a quarter of a second, Coast Guard officials said.

Doctors determined the laser did not cause any damage to the 13 crew members who were on the flights.

"In both instances the pilots noticed a bright green flash. When they looked over to see where it was coming from they thought they received a laser directly into their eye," Moss said.

The Coast Guard believes the laser light came from Kapolei. They do not know if it was a prank or something more sinister.

The laser suspected in the incidents has a range of 9,000 feet, according to the Coast Guard.

The Coast Guard is offering a $1,000 reward to information leading to finding a culprit in the case. They asked that people with information call 541-2301.