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Contact Lenses
Contact lenses are clear and flexible, and fit on the cornea of the eye to correct vision. Questions in this category can include how to purchase and care for contact lenses, as well as health concerns.
915 Questions
How do you get rid of air bubbles under a newly painted surface?
There is a similar problem when using clear lacquer. I find that the paint brush, even one with fine hairs, leaves a trail of tiny air bubbles. Most of these come to the surface and pop before the surface sets hard. However, there are always some left - which need to be sanded down with 220 grit sandpaper. And then one starts again! I have tried thinning the lacquer, and this helps a bit. I sometimes use a lint free rag, and dip it in the lacquer. This tends to take off most of the lacquer, but leaves very few bubbbles. Of course the best method is to use a spray can, but that needs a warm, dust free place. That is a problem in the Canadian winter. Using paint spray cans indoors is not welcomed by my wife! I do remember my father French polishing wooden instruments, like violins. He used a tight ball of rag, about the size of a golf ball. I think he also put a drop of linseed oil on the rag. That was true craftsmanship, but it looks as if that skill has been lost.
Can iris scans be forged by wearing contact lenses with an iris pattern on them?
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.
Can pinhole spectacle really improve your vision?
There is no evidence to show that wearing pinholes actually will improve your vision over time. However, pinholes do help you to see better while you are wearing them.
What is the lens in your eyes?
the lerns i you eyes are the contct lens it help you see at any way you wan it
No, a person should never sleep with contact lenses in their eyes. It can cause infections and other serious problems.
What Brand of contacts does Taylor Swift use?
In the music video for "You Belong With Me", Taylor wears a pair of huge, black eyeglasses (see http://www.mtv.com/videos/taylor-swift/377889/you-belong-with-me.jhtml). But, I don't know what brand they are.
In interviews she has stated: "I wear glasses. Pretty much when I don't have pictures taken or whenever I'm not on stage, whenever I'm in my downtime, I have glasses on. I have two pairs. I have one pair that's purple. They're pointed at the edges and they're thin. Then I have a pair of glasses that are really, really wide, bifocally-looking glasses that no one recognizes me when I wear. They're the pair of glasses that nobody was going to buy. They were really dusty and nobody wanted them. I felt bad for them, and I wear them everywhere. I bought them and I gave them a nice home. I love them."
Do colored contacts effect your vision due to the coloring?
Well some contacts leave a hole in the middle for your pupil as you look out through your pupil. I used to wear blue, brown, violet and gray contact lenses before... Based on my experience the color doesn't have any effect at all, unless ofcourse you put your contacts the wrong way. One way to know aside from the discomfort that you've put your contacts the other way around is if you blink & your contacts are loose enough to shift along w/ the movements of your eyelids.
Lenses may produce real or virtial lenses?
Lenses is known as a virtual lenses. This is something that you put on the eye to help see better.
What is the recommended age to wear coloured contacts?
Well about 12+. But just in case ask you r doctor that's the age I recommend.
When shopping for contact lenses you should make sure that they are doctor prescribed. You should also consider buying them in bulk.
How many lenses do ant eyes have?
The number is unknown. But there are hundreds of lenses in there eye.
Can you re use a dried out contact lens if you soak it in solution?
According to Bausch and Lomb, an eye care company known to all of you no doubt, you can do this for soft Toric lenses, so the same process would generally be applicable to soft lenses as long as you:
1. have not damaged the lens in the process of rehydrating it (if stuck you must SOAK it OFF first before moving it to a case to soak in solution for rehydration.
2. leave it in solution for a full disinfection period (follow the directions of your system). If it was dried out, bacteria could have multiplied on the surface while it was exposed. SO YOU NEED TO disinfect it for a full period per the directions of your system. Do NOT try to cut corners. In that period of time, it should also be fully rehydrated if it will ever be. If it does not rehydrate, do not try to use the lens of course.
3. If the lens is not comfortable when inserted, go to your optometrist or ophthalmologist and have the lens checked to be sure it still properly fits your eye.
CARE FOR A DRIED OUT (DEHYDRATED) OR
DRY LENS
If a soft, hydrophilic contact lens is exposed to air while off the eye, it may become dry and brittle and need to be rehydrated. If the lens is adhering to a surface, such as a counter top, apply saline or rinsing solution before handling.
To rehydrate the lens:
Handle the lens carefully.
Place the lens in its storage case and soak the lens in a recommended rinsing and storing solution for at least one hour until it returns to a soft state.
Clean and disinfect the rehydrated lens using a recommended lens care system.
If after soaking, the lens does not become soft, the lens should not be used until examined by the eye care practitioner.
If you still have doubts, do NOT use the lens until you have it checked. Your eyes are too valuable to risk a corneal abrasion or infection. If the lens feels right and you can see properly after reinserting it following rehydration and disinfection, you will likely be able to salvage the lens!
Are contact lens implants better than traditional contact lens?
Many people find lens implants to be a more comfortable, yet more expensive, solution to vision problems then traditional contacts. If you have the money and hate the hassle of traditional contacts, and aren't afraid of a little surgery, they it may be for you.
