If there are scratches on the lenses, it depends on the severity of the scratches and whether they have an impact on the corrected vision or not. If the scratches are relatively shallow or located in the periphery of the lens, it is not necessary to replace the lenses because they do not affect the vision. On the contrary, if the scratches are very deep or very many, located in the middle of the lens, this situation will affect the vision, if you wear such glasses, corrected vision is difficult to maintain in a normal state, so such cases need to be replaced in time, only then can see more clearly, to avoid eye fatigue. Eyeglass fitting is a medical activity, so if you need to replace your glasses, you must go to a regular hospital to get an optometric examination and wear glasses, which is the only way to be more accurate.