Glasses is a necessity in our daily life. Some people use them to rectify eyesight. Someone uses them to protect the eyes, Or as ornaments.

When the role of glasses is different, the election will be not the same as well.

• Accurate prescriptions are needed for correcting eyesights.
• High qualities are needed for protecting eyes.
• glasses of new styles are needed as decoration.

Different genders have different demands for glasses.

• Ladies, who are beauty-oriented,want beautiful glasses.
• Men pay attention to the quality.
• Children mainly depend on the quality of the nds card, for they need to correct defects of vision and they are in the visual development.
• The olders mainly select the bifocals and progressive glasses.

Different professions also need different kinds of glasses. For instance,

• Welder needs to wear welding glasses to protect their eyes.
• Aviators need to wear aviator glasses.

So that their safety can be ensured.

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Children cheap glasses can cure the eyes in general, and the beauty can be got at the same time. It’s the basic way to guarantee the right use of children eyeglasses by keeping the eyeglasses well protected. How can kids protect their own glasses well?

Glasses should be appropriately dposited. and do not let glasses lenses directly touch the desktop when they are not worn temporarily. When you sleep at night, be sure to put glasses inside the box, in order to prevent the lens from being abrased, crushed and broken. The glasses case must not be too soft, otherwise long time squeezing will deform the glasses, which will be tilted on your face and affect the eye-sight.

If there is dust or dirt on the lens, please do not casually use clothes or fingers to wipe it. It will abrade lenses and reduce the transparency, in the long run, glasses lenses will be opaque with a layer of mist. If there is oil or other dirty things on the lens, you should exhale one breath to make the dirt damp before gently rubbing it with glasses cloth. If children’s eyeglasses frams are worn off or lose the function to correct eyesight, parents should take them to hospital to take ophthalmic test and get a new pair of glasses.

When kids have sports or do other strenuous exercise, be sure to put off glasses inside the box. According to kid’s active and restless character, the material of frame is better to be plastic or glass-made. This kind of frame is wider, comfortable while wearing, but not easily broken nor hurt children’s eyes. Moreover, they are cheap in price and have been very popular among the public.

Frame size should be appropriate, some parents and children think that bigger frames are good-looking, while others believe that frames with small size are not easy to swap, which are incomplete views. Too big or small frames both will make children’s eyes bias from the optical center of glasses. That can’t correct vision, but will further the development of refractive error, even affect the normal growth of facial form. So parents should choose frames of sports eyeglasses according to children’s heads, faces and eyeballs and often change frames as children are growing up.

Tom Cruise used a series of high-tech glasses with camera, transmitting the image and displaying confidential informations in the movie “Mission Impossible”. Now, a similar high-tech glasses will bring good news for millions of visually impaired people. U.S. scientists have developed a liquid crystal optical zoom. You can change the focal length to obtain a better than normal vision simply by adjusting the knob on the frame. Scientists predicted that this technology will open the door to develop intelligent glasses. This latest technology is the invention of the University of Arizona USA and it has now been delivered to the state Academy of Science for invention identification.

The biggest difference between liquid crystal glasses and ordinary eyeglass frames is on the lens. The lenses of myopia lens on the market currently or hyperopia mirror are mostly solid glass and resin, which means that they will have only a fixed focal length. If the visual acuity is getting better or worse, the user would have to buy new lens. And the lens of liquid crystal prescription sunglasses was composed by two ultra-thin glass-coated crystalline liquid. The crystal is exactly the same as those on the computer screen. Through changing the strength of current flowing through the liquid crystal, the crystal molecules can be re-arranged thereby to change the crystal’s transparency and focusing ability.

In the identification thesis, the crystal in the lens is a concentric structure. When the feeble current flows through the lens, the crystal in the lens will shrink or swell in less than one second. Thus, the thickness of the crystal layer will be altered so as to change the focus.

In the trial, the model wearing such glasses can not clearly see the picture in front of 30 cm. The model can see it clearly at last by adjusting the knob on the frame, so that the focal length of liquid crystal glasses changed. Such glasses have also achieved good effect in the test for ordinary people.

Scientists predict that one day in the future, this technology may replace all glasses that remedy visual impairment. By adjusting the current strength, the liquid crystal of the lens can transform a variety of different focal length effects. This means it is able to freely transfer between nearsighted glass and farsighted glass. It is a plain mirror when the current of the lens was closed and the liquid crystal formed a even thickness.

Inventor believes that this technology will at least replace the current widespread use of bifocal glasses. In addition, glasses manufatured by this technology will particularly be suitable for drivers to increase the driving safety in the future. If it is combined with the automatic control technology, it is of no need for new products to manually adjust and become a real intelligent eyeglasses.