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Alexandrite a Gem for Kings

Alexandrite is the unique mineral among the other stones which are highly appreciated. Subject to international pricing catalogue, faceted pure 1-3 carat alexandrite from the Urals with the intensive effect of color changing costs from two to twenty thousand dollars per carat, while the less pure alexandrite from the same Urals will take you one to four thousands per carat. A big size stone is rare and if it is worth paying fortunes for something that is not a diamond?


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Laser Vision Correction

Sunday, 19 April 2009

laser vision correction Vision is an amazing gift of the nature especially appreciated by those who have significant physical defects in this regard. Through vision a human being perceives more than a half of the entire information from the surrounding world. Unfortunately, the increasing workload to eyes so typical in our world brings to various eye pathologies. It usually refers refraction ability of eyes, the ability to change or accommodate optical system of eyes when visualizing close or remote objects.

Thus, dry statistical data confirm that over 30 % of the world population wears glasses or contact lenses. M.S. Norbekov, the well-known author of the variety of popular books on the methodic of vision correction, called the lenses «crutches for eyes».

Recently it was possible to correct vision only by wearing glasses or lens, while it was used forever. However, by the late ХХ century the core point of the situation has not changed.

The attempts to correct the eye optical system date back the pre-war period when of the surgeons-ophthalmologists from Japan suggested a surgical operation in 1939 by means of applying special insections. And only 33 years after the Russian ophthalmologist Svyatoslav Fyodorov managed to significantly improve the technology of this surgery. Nevertheless, before and after the improvement there was still the risk of aglia and various kinds of micro traumas and complications. A new phase in evolution of optical operational technologies was the idea of laser eye surgery proposed still in 1949 by the Colombian native, Ch. Barracauer. This idea was implemented in practice only thirty five years after in Germany when the laser correction of vision was performed in 1985. Since that time the advantages of eye correction by laser technology are properly appreciated by all famous ophthalmologic clinics; yet, the said technology became an integral part of the modern practical ophthalmology.

So, what is the heart of the laser eye correction technique? To understand it in detail, we need to remember an eye structure. Every eye constitutes perceiving and image conductive parts. The perceiving part is the retina whereupon the image is focused. The leading function is performed by two optical elements in the conductive part of eyes, a cornea and crystalline lens which affect the focus of image. This focus should be located on the retina, as a rule, and in this case objects, perceiving by the eye, will have clear contours. And the image is blurred provided that the focus occurred in front of or after the retina. And in this case we consider nearsightedness or long sight also there is refraction pathology when the image is distorted. It happens with astigmatism cases.

With laser vision correction the «profile» of cornea is changed. During this procedure the laser ray does not burn the cornea, as many think, and does not penetrated farer of cornea borders, that is why troubles and disturbs on possible trauma of eye structures are quite vain. Laser removes the cornea parts that present the optical obstacle for precise focusing of image onto the eye retina. For instance, central areas of cornea layer are «smoothed» with nearsightedness and with long sight - peripheral areas of cornea layer. Prior to the procedure of the laser correction the patient is recommended to visit a specialist at the proper clinics who studies an opportunity of surgical operation, makes all necessary testing and determines the program of laser impact.

There are several kinds of laser correction techniques. One of them proposes careful insection of the very fine layer of the cornea (but it is not removed fully), that is slightly turned backward for easy access to internal layers of the cornea. In other cases the operation is performed directly on the superficial layers of the cornea.

Whatever technique is chosen by the doctor, the operation provides 100% vision correction in the short terms. And within first days after the surgery the patient is able to come back to his normal life style, but with new and valid vision.

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