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Most light scratches are the result of improper cleaning. It is important to always flush your lenses with running water before using lens cleaner or a cleaning tissue or cloth. Cleaning scratches often come from wetting the grit and dust on your lenses with lens cleaner and then rubbing them. The water that you use to flush the lenses should be slightly warm – not hot, and the cleaning tissue or cloth should be clean and grit free. Cleaning scratches are usually light, curved and on both the front and back of the lens. Scratches can also arise from using clip-on sun lenses, lying the eyewear lens down on any surface (i.e. table, nightstand, dashboard, etc.), or from grit on the lining of your glasses case.
If the power is correct, then the problem may lie in the angle or positioning of the lenses in front of your eyes. Every prescription lens has one point that gives exactly the right prescription. That point is usually placed so that it is somewhat below the center of your pupil when you are looking straight ahead. If this point is not correctly placed, your lenses will not work properly.