Wear Grateful

Contact Lenses And Why We Wear Them

We wear contact lenses mainly because we are vain.

But, they come in handy for any kind of sports, people even wear them while swimming although you have to watch they don't float out.

The Inventor of the contact lens concept was Leonardo da Vinci in 1508,who sketched and described several forms of contact lenses.

Hard contact lenses

Hard contact lenses are manufactured from a rigid material, PolyMethylMethacrylate (PMMA). This substance is also combined with other plastics to increase the oxygen permeability.
Visual acuity is perfect.

In 1632 Rene Descartes of France suggests the first hard contact lens, which idea was actually developed in 1801 by Thomas Young; resulting in a quarter-inch-long, water-filled glass tube, the outer end having a microscopic lens,and he is the first user.

In 1887 a German Glassblower, F.E. Muller of Wiesbaden,fabricates the first piece of glass acting as a contact lens which could be seen through seen through and tolerated.

Soft daily wear lenses have the main advantage that they allow the eyes to be oxygenated through the lens.

They're also easy to adapt to and difficult to lose. You can get them in all kinds of colours. Fantastic for wearing in sport activities.

Not a panacea for all vision problems and they have to be thoroughly cleaned. Maximum lifespan 1 year.

In 1936 William Feinbloom, a New York optometrist, manufactures the first American- made plastic contact lenses. These were still hard lenses.

The first soft, water-absorbing plastic lenses were developed in 1960 by Otto Wichterle and Drahoslav Lim .

Disposable lenses

1.Extended-wear disposable

Soft lenses that you are able to wear for an extended period of time, up to six nights, and then you can throw them away. They hardly require any cleaning and have virtually no chance of causing eye infection if user instructions are followed...

You can get them tinted and as bifocals. Your Vision may not be as sharp as with other lenses and they do not correct all vision problems. More difficult to handle.

2. Planned soft daily replacement lenses

Soft daily wear lenses that you replace on a planned schedule, either every two weeks, monthly or
quarterly. Require thorough cleaning and disinfection. all vision problems. Not easy to handle.

Colored lenses

There are 4 types of colored contact lenses:

visible tints,
tints to enhance,
color opaque tints and tints that filter light
Most of these colored contact lenses are available in plano form (without visual correction), as well as for astigmatism, who need bifocal correction, or who want a disposable or frequent replacement lens.

Astigmatic lenses (toric) were first introduced in 1978 and approved for distribution in the United States.

These lenses contain both a spherical and cylinder component to correct prescriptions which have astigmatism. Lenses may be thicker in one meridian or have modified thickness profiles to enable the lens to maintain the correct orientation on the eye.

Bifocal contacts became available in 1982 for commercial distribution.

There are a variety of designs in bifocals, essentially all trying to provide a transition or reading zone for use at near distances. The different designs include; aspheric multifocal - simultaneous vision concentric - has either a central near or distance zone with surrounding zone of opposite type to centre (eg, centre near,distance surround) diffraction/holographic - based on diffraction grating principles.

Eye exercises
There seems to be a natural alternative to eyeglasses, contacts, intacs, and even Lasik surgery, which is a series of eye muscle exercises over a period of 30 days that supposedly corrects your vision to quite an extent.

The validity of this method of vision correction has not been fully proven.

About the Author

About Cataracts by J Schipper Contact Lenses by J Schipper

Grateful Dead & The Beach Boys "Okie From Muskogee" 4-27-71

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Grateful Dead

Wolfgang's Vault New Music Includes Concerts by Steppenwolf, the Babys, Rick Springfield, Grateful Dead, Modern English and More

Wolfgang's Vault, the online destination where live music lives, known for adding two dozen new concerts for free streaming and download each week to its vast Concert Vault, today features concerts by bands as diverse as Grateful Dead, The Babys, Preservation Hall Jazz Band, Steppenwolf, Rick Springfield, and Modern English.

This week's additions:

Steppenwolf 1968

Grateful Dead 1971

Lou Reed 1973

Carl Perkins 1983

Jesse Winchester 1977

Modern English 1984

Scandal 1983

Simple Minds 1984

The Babys 1979

Creedence Clearwater Revival 1971

Preservation Hall Jazz Band 1968

Rick Springfield 1983

Dirty Projectors 2007

Autolux 2007

Grand Ole Party 2008

Damien Jurado 2007

The Spinto Band 2007

White Williams 2007

Frog Eyes 2006

The Concert Vault includes over 1,000 audio recordings of concerts from the Bill Graham Archives, Dawson Sound, Daytrotter.com, King Biscuit Flower Hour, Noise Pop 2007, Record Plant, and the Silver Eagle Country Music Catalog archives. All concerts in the Concert Vault are available for free streaming. Daytrotter and Noise Pop shows are free downloads, while hundreds of other concerts are also downloadable. The Concert Vault prides itself on the most carefully researched and complete show summary library, giving context and depth to the concert listening experience.

Other equally exciting news on Wolfgang's Vault includes:

Crawdaddy! The Magazine of Rock features great rock journalism on conceptual albums in a digital world, and a multi-part series chronicling the rise of a rock band in the changing music business.

Photography: Famed photographers Michael Zagaris and Baron Wolman captured the greatest moments in music history in their work. Browse Wolfang's Vault's photo gallery for a beautiful image of RFK 1968, or the joyful image of Preservation Hall Jazz Band's past, as they revel in the success of their recent popular New Orleans Jazzfest.

Wolfgang's Vault celebrates 40 years in image since 1968: The Year That Changed The World.

The Vault store has great items for the service men and women in your life, plus great items for dads and grads gifts to fit any budget.

About Wolfgang's Vault:

Wolfgang's Vault is the online destination for live music and the world's largest collection of live concert recordings and vintage music memorabilia. What began with the personal archives of famed promoter Bill Graham now includes 10 different archives. Music lovers find free music streaming online here with hundreds of concert recordings from the last 40 years, digital downloads, and thousands of rock posters, photos and t-shirts available for purchase.

About the Author

Started as a free lance writer earlier for Maharashtra Herald Newspaper, then with the Pune-Mid-Day. Have also contributed for articles on websites

Grateful Dead - Truckin'

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