After so many years of research, it is discovered by experts that there are many factors resulting in shortsightedness. For instance, it mainly arise from heredity, environment and fatigue. At the moment, the most obvious factor is heredity because as static refers that a majority of wearers’ eye situation is similar to their parents’. But it is not said that if parents have worn eyeglasses, their kids are sure to wear glasses. About 46% of wearers have suffered from this case.

The other factor is environment, including nature environment and living environment. The rate of myopia between city habitant and country habitant is quite clear that more people wear eyeglasses in city than in countries. As the pace in big cities is faster, children have to spend more time on playing with high technical tools like computers which differs a lot with children who always play outside. On the other hand, our planet has been polluted by all kinds of sources. Fogs, polluted water and wasted are secretly influent our health, so as to do harm to our eyes. Some reports tell that eating too much sugars will bring myopia comes about. Moreover, bad habit of using eyes are closely relevant to myopia, such as the wrong gesture of reading books or writing.

Myopia suffers can easily been divided into two parts. The first one is wearing eyeglasses during puberty. When they are at about 11 or 12 years old, they become to squint to see things and wear eyeglasses. When their bodies are mature enough, diopters will not change any more.The other part is caused from eye diseases which is so complex to correct that they have to replace their glasses regularly in order to keep up with their eye needs. So a lot of them have to wear high index lenses.

In fact, the teenagers are still in the growth process, Their axis aculi have been still in the growing stage. If you child needs a pair of eyeglasses, you should know what to look for before you start shopping. If your child has crossed eyes or has the lazy eyes. You must choose the proper prescription glasses for special problem. Everyone has their only personal style and taste, so take your child along whilst choosing the safety glasses and let them have a say in which ones they like. Just ensure that they provide adequate protection for their needs.

Here are a huge number of options for child safety glasses.
Thinner, lighter and stronger materials for kids eyeglasses frames, like stainless steel and titanium, are becoming very popular in children’s eyewear.Titanium is a silver-gray metal that’s lightweight, durable, strong and corrosion-resistant. And Nylon is one kind of plastic frames which is also a premier material for sports and performance frames that are very resistant to hot and cold and are more flexible, yet also stiff. Frames made from these durable materials are great for kids who are hard on their glasses.

Polycarbonate lenses are the best choice for children’s eyewear.Most kids’ eyeglasses are made of polycarbonate. Polycarbonate is an impact-resistant material that is also used in safety lenses. These special lenses do not shatter on impact like glass or regular plastic lenses, reducing the chance of eye injuries in active kids. Many eye doctors choose to use only polycarbonate lenses for children’s glasses. Since the lenses are shatter-proof, a child’s eyes won’t be damaged by shards of flying glass or plastic if the glasses are hit hard by a ball or a bat.

You can also purchase scratch-resistant coatings that can be applied to the surface of the lens. This coating makes the lenses even more resistant to scratching which may last a little longer. And a pair ofsafety glasses also should equipped with a UV protective coating.UV rays can be very harmful to your child’s eyes. Long term exposure to UV rays can lead to cataracts and macular degeneration in later life. If your child like sking or other outdoor activities, UV protective coating would play a good role.