The experts warn men with frame eyeglasses, do not drop your outdated glasses at once if you buy a new one. Working a long time before the computer screen,our eyes appear:tears,foreign body sensation, things to be unclear even vision decreases.

And the wearing of the original spectacles will protect your eyes from the permanent hurt because of the fatigue brought by excessive asjustment. In general, the strength of old glasses is 1.25 diopter less than that of new ones. Wearing sunglasses to look at computers is the most appropriate. Normal person is endowed with a gift in adjustment by nature. No adjustment is needed to watch the far place on principle..

If the object is moved close to 5 meters, it can only been clearly seen by eyes adjustment. As closer the object moves to you, your eyes have to adjust more to see nearby objects clearly. If people always look at things up close, then the adjustment of eyes will often be used. Crystal, ciliary muscle and the suspensory ligament of prolonged tension will trigger tears, foreign body sensation and so on. Therefore, reducing the strength of myopia men sunglasses by 1.25 diopters appropriately is good for eyes. Following is points for attention of contact lenses. Read the instructions carefully in order to have a tight grasp of the correct methods and requirements of wearing and taking off of contact lens. No matter what kind of contact lenses you wear, in principle, they should be taken off to have cleaning and disinfection in accordance with regulations every day. People had better not wear glasses while sleeping, so that the cornea can have a natural breathing, and thus to reduce complications.

Taking out the lenses gently to avoid hurt of glasses and cornea. Once eye pain, photophobia, tearing, hyperemia are discovered when wearing the glassed, you should immediately take off the lens and temporarily stop to wear by placing them inside the box and go to the hospital for a treatment in time. At the same time, bring the unclean lenses the case with you to do the necessary laboratory examination. And choose more effective medicine according to the examination result. The lenses which aren't used temporarily should be closely stored in a lens box with sterile saline solution or the whole care liquid after cleaning and sterilizing to prevent the lenses from been polluted and dried. In recent years, there have been disposable contact lenses, which can be disposed after the use, so as to reduce infection, but they still need timely cleaning and disinfection treatments. In normal circumstances, the lens can move 0.5 - 1 mm on the surface of the corneal without causing vision fluctuations and discomfort.