get Rid of vision problems will help gel the lens

get Rid of vision problems will help gel the lensSoon scientists will begin testing a new method for correction of age-related vision deterioration. A new method, which involves replacing the content of the crystalline lens of the eye soft polymer gel that will allow millions of people to throw glasses. "First, we believe this method could be used as an aid in the surgical treatment of cataracts," says Arthur Ho from the University of New South Wales, one of the leading specialists governmental organizations Vision Cooperative Research Centre (Vision CRC), which has been working in this direction. But as soon as it is proved to be safe and effective it will be used to help young people who need reading glasses". In the human eye focusing lens is due to the change of its shape. When the eye muscles are relaxed, the lens becomes flat, and come in sight of the distant objects. When the muscles are reduced, the lens takes on a more convex shape and focus on close objects. But with age, the lens becomes more rigid and difficult to take a convex shape: lenses 40-year-old man retain only a quarter of the possibility to change the form or, in scientific language, "to accommodate". After 45 years, most people need reading glasses or dvukhfotonnye glasses. In the late 1980s, Jean-Marie Parel from the University of Miami proved that replacing the content of the crystalline lens of the aging rhesus macaques silicone oil can restore its ability to focus. However, over time, silicone oil begins to penetrate through the wall of the lens capsule. Since then, scientists worked to create a polymer, which had the same refractive index as the human crystalline lens, and would have a suitable biomechanical qualities. Estimating about 30 different polymers created in an Australian research Institute CSIRO Molecular Science in Melbourne, Ho believes that suitable material is found. This substance, based on the siloxane, which after his introduction into the shell of the lens is treated with ultraviolet rays or visible light to turn from liquid to gel. As shown by tests conducted on rabbits and monkeys, this substance has on average the same index of refraction as a healthy lens, and can afford to read, even if the eyes will be at a distance of 10 cm from the text. While there were just a few experiments on human eyes, but the quality of this polymer can safely say that reading the operated patients will be able with ease. Implantation of the gel will resemble the current operation for cataract. However, after a small incision in the cornea instead of cut lens, the doctor will make a tiny hole in the shell and with the help of a special device will suck out the contents. Then in the shell of the lens is injected gel on density comparable to a thick oil, and the new lens is treated with ultraviolet light or visible light, which transforms this substance in the gel. "It will be a quick, 15-minute procedure," says Ho. Such operations very successfully conducted on rabbits group of scientists headed by Parel in Miami. However, the lens of adult rabbits not accommoderait, so the next step is to master this technique on living rhesus monkeys, whose eyes are similar to the human eye. Work in this direction will begin in late 2003, and at the most favorable development, says Ho, "we need to start human trials by the end of 2004. Hugh Taylor, Director of the Centre for eye research in Melbourne, is optimistic: "This technique have a huge potential. If all goes well, it will radically change ophthalmic surgery," said he. New Scientist (translation Inopressa.Ru).



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