However, many people should still invest in a great but inexpensive hard sunglass case, even if their optician provided them with a case when they purchased their corrective lenses. Opticians and prescription glasses stores have a tendency to buy cheaply and poorly made cases in bulk that are usually soft as opposed to hard sunglass cases. These soft cases may prevent scratches on the lenses, but do nothing to prevent the frames from being twisted or manipulated. An investment in a hard case for under ten dollars can ensure the life of a pair of glasses that may have cost far more.