The Lens is not an interchangeable part between blurry and Std DVD.
If you want Blu ray accessibility and assuming your referring to a Windows machine. The best option is to buy an external blu ray drive. They are designed specifically for external use and have the drivers for the OS, they also are reasonably inexpensive compared to a few years ago. If you are using an Apple or Linux you will need to check the drive manufacturer to ensure they support your OS with corresponding drivers before you buy.