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Transparent Plexiglass
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 Red Plexiglass Acrylic transparent 1 pc 1/8" x 6" x 12"  US $4.99
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 Yellow Plexiglass Acrylic transparent 1 pc 1/8"x 6"x12" US $4.99
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 Blue Plexiglass Acrylic transparent 1 pc 1/8"x6"x12" US $4.99
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 Blue Plexiglass Acrylic transparent 1 pc 1/8" x 12" x 12" US $7.99
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 Red Plexiglass Acrylic transparent 1 pc 1/8" x 12" x 12" US $7.99
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Prototypes of contact lenses exist since Leonardo da Vinci's 1508 Codex of the Eye, however the first time that such a devise was proposed to correct vision was in 1636 when René Descartes proposed a liquid-filled glass tube shaped to correct vision, however, this model was not practical for use since it prevented blinking. In 1801, Thomas Young constructed a devise that was not intended to correct vision but it was rather a learning devise for eye accommodation mechanisms, this devise is considered a precursor of contacts.
In 1845, Sir John Herschel proposed two ideas for vision correction, one of them being to form a mold of the cornea impressed onto a transparent medium, but it wasn't until 1887 when F.E. Muller, a glassblower from Germany, produced the first see-through and tolerated eye covering, and in 1888, Adolf Eugen Fick, a physiologist from the same country, began successfully fitting contact lenses in rabbits, himself, and later on in volunteers. These early contact lenses where 18-21mm in diameter, made of blown glass and the space between the eye and the glass had to be filled with a dextrose solution. Because of the size and weight of the lens, they could only be worn sparingly.
In 1929, Hungarian Dr. Dallos perfected a method to mold the cornea of a living eye and therefore allowed the production of lenses that conform to the shape of the human eye. In the 1930s, polymethyl methacrylate (PMMA/Plexiglass) was developed allowing the first glass-plastic lenses to be introduced to the public by optometrist William Feinbloom.
In 1949, corneal lenses were developed which sat exclusively on the cornea instead of over the entire visible ocular surface, these lenses could be worn all day long and in the 1960s they became widely popular. One problem with the PMMA contact lens is that its impermeable material does not allow the exchange of oxygen particles and therefore can have some adverse clinical effects, so at the end of the 1970s, and through the 80s and the 90s, many oxygen-permeable materials were explored and introduced into the manufacture of contact lenses.
In the 1960s the first "soft" lenses were introduced, following a breakthrough by chemists Otto Wichterle and Drahoslav Lim in Czechoslovakia, and in 1971 the Food and Drug Administration (FDA) approved the "Soflens" material in the United States. Since these soft lenses are more comfortable than the PMMA hard lenses, they became more and more prescribed and popular. With the creation and application of silicone hydrogels, which are highly permeable to oxygen, to contact lenses in 1999, the soft lenses comfort and safety was perfected and lenses were first approved for overnight use.
For more information about the history of contact lenses click here.
Buying contact lenses online is for many a more affordable solution than the average high street optician. Lower costs allow online suppliers of contact lenses to offer lower prices than many high street retailers. Visit http://www.lensfinder.co.uk to compare the price of contact lenses from major online UK retailers and find the cheapest price for your contact lenses in the UK.
How Public Contact Employees Can Protect Themselves From Bird Flu
The best way to protect yourself from bird flu during a pandemic is to avoid all contact with other people.
However, this is impossible for people who must continue to report to a place of employment. Work will be especially dangerous if your job is to meet and deal with the public.
However, most people will want to continue to bring in a paycheck, so we'll be torn between the desire to ensure our safety by remaining home and the need to bring in money to pay the bills and buy whatever food may be available.
First of all, a lot of business that is currently done in person could be handled over the telephone. Employers should encourage customers to use the telephone or online services as much as possible. This will also protect the customer from possible exposure to bird flu.
But whether you are a cashier at a fast food restaurant, a cable TV installer or a welfare caseworker with clients who can't keep their telephone service on, you will still have to deal with some people face to face.
If allowed, wear a Nanomask at all times. Although many employers may object in the beginning of a bird flu pandemic, by the time millions are dying they should recognize that it should actually reassure customers that you are looking after their safety as well as your own. After all, after a customer with bird flu infects you, you could pass it on to the next customer in line.
If customers must do any writing or signing, leave pens out in their area. Do not give them yours. Do not touch the pens they have touched. If you must, wash your hands afterward.
Unfortunately, you may have to touch paperwork or, of course, their money. Cash money actually carries a lot of germs even now. We just rarely think about the hygiene implications of handling money given to us by other people. So if possible, employers should encourage customers to pay by credit or debit card. Employees don't need to handle the physical cards, just get the numbers and other necessary information from the customer.
Wear rubber or plastic gloves if you have to handle papers or cash handed to you by customers.
If possible, put a barrier of transparent plexiglass between you and the other person. This will help protect your from their germs if they cough or sneeze.
Fast food restaurants should encourage customers to use the drive-through facilities and discourage eating inside.
Keep a bottle of a germicidal hand lotion by your side and put some on your hands between each customer.
Give everyone coming into your business access to a bottle of germicidal hand lotion and encourage them to use it on their hands before touching anything.
Again, while many such measures would be perceived as offensive to customers during normal periods, a bird flu pandemic is not a normal period and they should understand that when everyone is in great danger from infection, every measure you take to protect yourself, also helps protect them as well.
Of course, during a bird flu pandemic the riskiest public contact job will be providing medical care to bird flu patients.
I can't give advice on that score, except to say please follow all rules and regulations to reduce your exposure to bird flu and to reduce the chances of you infecting other patients. And remember that barrier nursing and diligent hygienic procedures protect you as well as your patients.
About the Author
c 2006 by Richard Stooker
Richard Stooker is the author of
How to Protect Yourself and Your Family From Bird Flu
and
I need a glass tube that is u-shaped and of no less than 5-6cm diameter. Where can I get it?
The wider the U, the better. What is that thing called and where can I buy one? A plexiglass one will do, too - as long as it's transparent.
I want to use it as a "bridge" for my fish, so they can swim between two fishbowls! No laughing, I'm quite serious about this.
Actually, the bigger the diameter, the better... but 10cm, tops (=at most).
I was thinking of something like what we used in an organic chem lab... but that tube would have been too thin. I need a wider one.
Visit your local neon sign maker. He can easily make a shaped glass tube. And probably show you how to do it yourself.
Marijuana providers look to build respectable businesses
A few things stand out when you walk into the office of ZooMountain Natural Care Inc. in downtown Missoula.
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