This really depends on the poor quality of your sunglasses and your ill-mannered glasses use. Proper usage and care for the sunglasses will be recommened. I have five pairs of glasses, three of which are my regular glasses. So, you may need to take turns in your sunglasses. The main reason why your favourite ones broke down in a certain period is your frequent-used, reducing their servicing life. A specifically-designed micro-fiber cloth are great for eyeglasses. Besides, soap and warm water must be the good company for cleaning the lenses. Further, you actually need a commercial eyeglass lens cleaner.There is needless to say, when picking out a new pair of sunglasses, the brand of the glass play an important role in its quality. As we all know, the name on a box simply identified what was inside.