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eyeglasses:
Introduction To Prescription Eyeglasses!
By andriagoodman
Eye problems are quite common around the world. There are several eye problems that demand a person to wear prescription eyeglasses. Among these, three very common eye problems that can be treated by wearing prescription are (a) Myopia or nearsightedness, the common symptoms of Myopia are blurred vision and helplessness to focus on distant objects. (b) Hyperopia or farsightedness, opposite of Myopia. The symptoms of Hyperopia are headache, eye fatigue after reading or watching television. (c) Glaucoma- the saturation of fluid on the retina. Glaucoma comes without any warning signs and it can cause loss of sight if left untreated. Hence, one should get his/her eyes checked up at least once a year for any eye problems.
The strength of prescription is measured in dioptres. A normal prescription will contain spherical dioptre values, cylindrical dioptre values, Axis Value and any addition values. Some commonly used abbreviations in an eyeglass prescription are: DV = D.V. is an abbreviation for "distance vision". This specifies the part of the prescription designed primarily to improve far vision. NV = N.V. is an abbreviation for "near vision". This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens. O .D. is an abbreviation for oculus dexter, Latin for "right eye." And O.S. is an abbreviation for oculus sinister, Latin for "left eye". (Some eyeglass prescriptions simply say "left" and "right" instead of "O.S." and "O.D.")
The lenses of Prescription are manufactured from diversity of materials. Glass lenses (which was once upon a time the most commonly used material), it comes in several diverse colours and has
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very good scratch resistant properties. Also, it is the least expensive. Disadvantages of a glass lenses are (a) its heavy weight; (b) It is fragile. Another material that is used to produce prescription is high-Index artificial lens. It absorbs ultra violet rays very well. This kind of lens is much lighter in the weight than glass lens but at the same time it can also be scratched very easily. Resin Plastic is one more kind of the material used in manufacturing prescription eye lenses. These are the lightest of all the lenses and are very fast replacing the use of glass lenses. These lenses don’t offer high level of defence against the ultra violet light, but there are a variety of coatings available in the market which overcomes this shortcoming of these lenses.
A wide variety of coatings can be applied to prescription lenses. An Ultra Violet coat protects the eyes from harmful UVA and UVB rays. A scratch resistant coating to the prescription reduces the chances of scratches on the lens due to normal day to day handling. The most recent type of coating is the anti-reflective coating. It reduces mirror images as it allows light to pass through the lens.
People also get their prescription tinted with a wide variety of colours. Tints increase comfort in bright light situations, reduce glare from computer screens or fluorescent light, and make a fashion statement as well.
Today, not only are prescription a necessity, but to some people they are a fashion accessory as well. Top designers like Giorgio Armani, Eddie Bauer, Calvin Klein have picked up this latest fashion trend and have started designing their own collection of frames for prescription eyeglasses.
This article is written by andriagoodman working with Spec2vision which is an ONLINE SUPERSTORE who offers High quality Prescription Glasses at very very low prices.
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decent article on eyeglasses:
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The discovery of eyeglasses aided people to fight the battle against defective vision. Soon the manufacturers started a lucrative business but the products were not very comfortable and didn't have a Read more...
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Logitech Alto Keyboard Puts Laptops at Eye Level
Dell also has one if I'm not all wrong. This is just a tad cooler tho. People will ask me: Whats that? And I'll go: It's my notebook-holder with an integrated keyboard painted in a smooth ninja-like color. Richaard
Logitech Alto Keyboard Puts Laptops at Eye Level
But who is going to carry a laptop, then carry this around with it. You might as well bold a handle on top of a desktop. Eugene
Logitech Alto Keyboard Puts Laptops at Eye Level
HP has had a docking station that does the exact same out for at least 2 years. Bitaemo
Logitech Alto Keyboard Puts Laptops at Eye Level
I remember Dell had a docking station for my old D800 that did the same thing. It was usefull for the fact that I did not have to worry about any of the cables and it raised the LCD to a level more akin to a desktop monitor. Nice to see a version that can be used by any(?) laptop.
I really like the fact that its portable, the Dell vesion was a monster and not portable at all, and it did not have the built in keyboard.
hmmmm maybe it was not "the same" but the idea was there. Pyper
Logitech Alto Keyboard Puts Laptops at Eye Level
Too bad they not compatible with docking stations/port replicators. Geisrud
Logitech Alto Keyboard Puts Laptops at Eye Level
I just buy a spare keybaord form e-bay for less than $10 after a year or so when they start to show up in good numbers. Saved me when my cursor key stuck a few months ago I was able to pull my spare out of storage and swap it on. Much better than having to use an external keyboard. Eugene
Logitech Alto Keyboard Puts Laptops at Eye Level
Guys I think he's kidding about the posture.
Have some leftover candy and relax!
I use an external KB for gaming on mine so I'm not putting the excessive wear on the "home" keys.
I like the whole concept, especially since it protects the keys when folded up.
Carrying an extra KB is cumbersome, but this will ease that a bit and will likely survive longer on the road.
strider_mt2k
Logitech Alto Keyboard Puts Laptops at Eye Level
I had the exact same thought. I've used a laptop exclusively since 1998 and don't sit hunched over or have any spinal problems. I've noticed that most people seem to think they need toslide the laptop back and plug in an extra keyboard and mouse, maybe that caaounts for part of it. Or maybe because they sit their chairs too high, every time I sit down at some other chair I end up banging my knees on the table/desk, those up too high chairs would make one hunch. Eugene
Logitech Alto Keyboard Puts Laptops at Eye Level
I'm not quite sure why you have to hunch to use a laptop, when I put mine on a table or desk I don't think I hunch, but perhaps I do. If you have to hunch to use it, why not ether get this, or get a desktop for home use. I use my desktop for gaming and other entertainment, and my laptop for working (as a writer I like to write other places than my dorm room). WCD_Thor
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