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Depends on the system.
There are methods to recognize if it is a person, if it is a high resolution picture of an iris or if a person is using a "fun" contact lenses, but the companies (that deliver iris recognition solutions) should implement these procedures on their systems.
It is also possible to know if a person is using eyedrops to avoid iris capturing.
Specifically about the main question I haven't read nothing about it (lenses with a pattern and I think it is too costly to produce them), but the companies should test their systems and know its vulnerabilities.
If you want to know more about Iris Recognition systems I recommend you to read:
Kevin W. Bowyer, Karen Hollingsworth, Patrick J. Flynn, Image understanding for iris biometrics: A survey, Computer Vision and Image UnderstandingVolume 110, Issue 2, , May 2008, Pages 281-307.
Ahmad N. Al-Raisi, Ali M. Al-Khouri, Iris recognition and the challenge of homeland and border control security in UAE, Telematics and InformaticsVolume 25, Issue 2, , May 2008, Pages 117-132.
What else can I help you with?
What are the advantages of wearing grey contact lenses?
What are the advantages of wearing grey contact lenses you asked? Grey contact lenses will turn everything to a higher contrast but they are more expensive so it outweighs the benefits
How is it possible to get an infection by wearing contact lenses?
An infection can be caught from wearing contact lenses that are not clean or sterilized. Similarly, if the contact lenses are left in the eye for too long a period then the eyes may become infected.
Does wearing contact lenses affect the baby when pregnant?
No.
Does wearing clear contact lenses enhance eye color?
Not exactly but wearing contact lenses glitters your eye -- your eyes feal watery and shining.
What has the author Lois M Reese written?
Lois M Reese has written: 'Helpful hints for wearing your contact lenses' -- subject(s): Contact lenses, Soft contact lenses
Does wearing contact lens contribute to any health issues?
There are no known major health issues to wearing contact lenses. Though without proper hygiene and care of the lenses they can cause eye irritation and infection. It is important to consult with your optometrist about any questions or problems you have with your contact lenses or before beginning to wear contact lenses.
Can you wear contact lenses a day before you go back to the eye doctor during an eye infection?
if you have an eye infection you shouldn't be wearing contact lenses.
Shoud I be Wearing contact lenses overnight?
No, you should be taking them out every night.
When should you use contact lenses?
Whenever you want to avoid wearing glasses.
Can i put contact lens solutions in my eye while wear contact?
No, you should not put contact lens solutions directly in your eye while wearing contact lenses. Contact lens solutions are meant for cleaning and storing lenses, not for direct application to the eye. If your eye is feeling dry or irritated while wearing contacts, use lubricating eye drops recommended by your eye care provider.
Where can one find images of cat eye contact lenses?
Most pictures are not of the individual contact lenses, but of people wearing them. An excellent source would be a website called YouKNowIt which displays a variety of cat contact lenses as well as the cost.
Is it safe to iron hair while wearing contact lenses?
I'm not sure why it wouldn't be.
