Glasses should be properly maintained. It is necessary to do so not. If a pair is maintained well by a person, it can last for a longer time. At the same time, a pair which is well maintained protects a person's eyes well. More and more people wear a pair of glasses today because of the bad habits of reading and using computers. If you are such a person, you need to learn the correct ways to keep it well.   When you put it down, remember to face up the lens. If not, the lens will be fluffed because of the friction. And this will affect the clarity of visual objects. Remember to check whether the frame is loose or not usually. If it is loose, you should adjust it as soon as possible. Go to the shop where you buy it and ask the retailer to tight the screws for you. Do not put it in the place where it is hot and humid. Such an environment is not good for it. Scratches should also be avoided. Each time when you wear it or take it off, you should be careful to prevent falling down.   When you are wearing or putting off a pair of glasses, remember to use two hands. If not, the frame will soon be deformed. This is very important. And keep it away from acids alkalis and other corrosive liquids. These will damage it. Be careful when you are doing strenuous exercises or doing housework. Either glass or resin may break when you wear it for exercises. If it is possible, put if off.   When you don't wear it, you'd better wrap it with the cloth, then put it into the box. At the same time, cosmetics, hair spray, medicines and other corrosive materials should be avoided. Do leave it in somewhere wet like the bathroom or somewhere dry and hot like the kitchen.   Cleaning is essential. Yet you need to learn the correct cleaning methods. You should clean it with a clean cloth. Hold one side of it when you are cleaning it. And avoid excessive force as it will damage the frame or the lens. When the lenses are too dirty, you can use neutral detergent to clean it. Then wash it with water. After that, make it dry with a dry cloth.   Each day when you go to bed, wipe the sweat and acid of the nose pads and the fame. This may extend its life. Don't be lazy. If you want your glasses last longer, you should do it everyday.   A person who is short-sighted should wear a pair of glasses. At the same time, to keep the glasses well is essential. A pair which is not well maintained is harmful to the eyes.