The use of iris to identify the identity of aircraft passengers is actually nothing new. Why is iris scanning technology better than other methods such as fingerprints and face recognition that use biotechnology to identify authenticity? Let's put it this way, like all recognition technologies, iris scanning technology must find a balance in preventing two risks: one is to allow the wrong person to pass, and the other is to stop the person who has no problem. Therefore, this system needs to find as much as possible More contrast points to reduce the chance of the first situation-mistakenly assume that the impostor is a legitimate user and let him pass through the ground, but also to ensure that these contrast points are as unique as possible to reduce the latter situation Odds-Misunderstanding legitimate users as impostors. What does not mean in the article? ['Iris recognition technology has been applied to identify the identity of aircraft passengers.', 'Iris recognition technology is better than fingerprint recognition technology.', 'The uniqueness of the individual iris makes the iris recognition smart card serve the function of identifying passengers.', 'Iris recognition technology is convenient and accurate, and can be widely used in other fields.']