Experts advise people who wear frame eyeglasses shouldn't throw away the old glasses while getting new ones. After long time work in front of the computer screen, the following phenomenon will occur to your eyes: tears, foreign body sensation, unclear or even decreased vision.

You can put on the old eye glasses to avoid the permanent eye injury due to the fatigue by excessive adjustment. Generally speaking, the degrees (strength) of the old glasses are 1.25 diopter less than the new glasses. Wearing the old sunglasses for looking at computer is the most appropriate. The eyes of normal people have natural protency of adjustment, and in principle, the eyes need not adjust themselves when looking into the distance.

But when the object approachs to a place within a range of five meters, the adjustment of eyes is needed to have a clear vision of it. The nearer the object moves, the more power controlling your eyes have to adjust to see it clear. If people always look at things up close, then the adjustment of eyes will often be used. It may cause the long time tension state of crystalline lens, ciliary muscle and suspensory ligament of eyes, then resulting in the discomforts such as lacrimation and grittiness. Therefore, reducing the strength of myopia glasses frames by 1.25 diopters appropriately is good for eyes. The points for attention when wearing contact lens are as follows: 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. In principle, whatever contact lens you wear, they should be taken off every day for cleaning and disinfecting according to the instructions. People had better not wear glasses while sleeping, so that the cornea can have a natural breathing, and thus to reduce complications.

You should be gentle when removing lenses, in order to prevent damages to the lens and cornea. In case you have the discomforts such as eye ache, inability to stand light, lacrimation and hyperaemia, you should take them off immediately and put them in the contact case, and then you must see a doctor without delay, Meanwhile, you should bring with the box and lens that has not yet been cleaned, in order to make the necessary laboratory examination and choose more effective treatment options according to the test results. 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. There are disposable contact lenses in recent years. It can reduce infection by abandoning but also needs cleaning and disinfecting treatments in time. In normal circumstances, the lens can move 0.5 - 1 mm on the surface of the corneal without causing vision fluctuations and discomfort.