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myopia are not all equal, three Contraindications

The Myopia is a visual defect that affects almost one person in three in the world. But what

caused by what is and what are the causes? what's the problem?

To answer these questions just think that the light rays coming from infinity (so called parallel) are focused in front of the retina, because the refractive power of the eyepiece diopter is excessive in relation to the length of the bulb. I have therefore over-convergence (dioptric power greater).

From a purely medical myopia can be of three types: simple, intermediate or pathological . Myopia is simple queslla that raises fewer problems because it does not exceed 3 diotttrie and above does not present any alteration from the point of view of the retina.

If you exceed the 3 diopters we enter the second phase of myopia intermediate which generally does not exceed 7 diopters, is obviously more important as a kind of myopia, but no serious damage to the cornea.

Serious damage instead presents them to the cornea of \u200b\u200ba patient afflicted with pathological or degenerative myopia is almost inevitably associated with lesions of the sclera.

To resolve the short-sightedness is needed to refractive surgery. The introduction of phakic lenses can solve even the most severe cases of myopia.

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different types of tattoos and all normal 'henna

tattoos are increasingly popular, especially in the summer if they see a display of all kinds and all colors of skin the Italians sunbathe. The question many people ask: is risky get tattoos? What contraindications are there?

According to a study of researchers at the University of British Columbia (Canada), and published in the International Journal of Infectious Diseases getting a tattoo is risky, can lead to contract hepatitis C, but also HIV, hepatitis B, bacterial or fungal infections, and allergic reactions to skin .

The researchers examined 124 sricerche conducted in 30 countries, including Italy. Discovering that the incidence of hepatitis C after a tattoo is directly related to the number of tattoo flaunted on the body. To run a tattoo, the researchers calculated, must be drawn on the skin that is the tip from 80 to 150 times on average. "Since tattoo instruments come in contact with the blood and body fluids - Siavash Jafari said, one of the authors of the survey - the infection can be transmitted from one person to another, if these tools are not sterilized after each use if and you do not follow proper hygiene rules. " Again, the inks are not often kept in sterile containers, so they can act as' carriers in the transmission of infections, Jafari warned. "That's because customers, and generally the whole population, must be informed of the risks associated with this practice - he adds - and the tattoo artists have to talk about the dangers before running a job. "

According to the survey numbers are growing, and often those who are tattooed to replicate once the operation ends. So it is now appropriate to develop guidelines specific to the control of infections with tattoo, for artists and fans, also planning regular inspections to ensure compliance with these rules and report any adverse events. Not only that, the scholars invited to monitor the population groups more likely to experience the charm of tattoos (especially the 'under 30' and prisoners) to reduce the rate of spread of hepatitis. Eye, finally, to inks, in some cases were used to paint the house, ink printers of the PC or other non-specific products, which contain potentially harmful toxic substances. The passion for designs that glow in the dark, fashionable among the young, according to researchers is to keep an eye on the possible health hazards are not yet known.

careful because even the tattoos all 'Henna not without risks. The natural dye of Henne is usually added a compound, the para phenylenediamine , which serves to darken the tattoo. This substance increases the risk of an allergic contact dermatitis, at least according to English researchers of the Department of Dermatology, Complejo Hospitalario ToledoBuenos Aires.

This is the text of the original research of British Columbia .

This is the original text of the risks of tattoos to 'henna .