how to clean glasses?

  In universities, only a small number of students have excellent eye sight. In such circumstance, many people have to draw support from glasses. As for glasses, when people wear them for some time, they will become not clean because of dust in the air. Therefore, how to clean glasses is quite important for a large number of people.

  In fact, eyeglasses have a life span. As for resin lenses, they can be used for 2 years and glass lenses have 3 to 5 years’ life span. So people have to change glasses when they have reached the life span. Certainly, cleaning of glasses can not be ignored. Resin lenses can be affected by static electricity so they are easily polluted by dust in the air. Cleaning of resin lenses is very easy. First, we can wash the glasses by clean soap water. Then we should clean it again with running water and dry it with soft cloth. In addition, we can not dry glasses first for they ought to be cleaned by water first. Glasses are not strong enough so we have to clean them softly. Otherwise, they can be broken. Glass lenses are harder than resin lenses so they can be cleaned by cloth directly first. Apart from the cleaning method mentioned above, people can also make use of a little detergent to clean eyeglasses. After washing glasses by water, users drip a little detergent on them. Then the dust will be washed away according to lamina flow principle. In such case, it is not necessary to dry glasses with cloth.