System and method for controlling a position of a lens of an optical disc drive to determine cleanliness of the lens

A system for determining a cleanliness of a lens of an optical disc drive, the system comprising:

• a controller configured to
• control movement of the lens of the optical disc drive between (i) a first position relative to an optical disc and (ii) a second position relative to the optical disc, wherein
• first position is located a first distance from an outer surface of the optical disc,
• the first position corresponds to a position causing the lens to focus light on a data layer of the optical disc,
• the second position is located a second distance, different than the first distance, from the outer surface of the optical disc, and
• the second position corresponds to a position causing the lens to focus light on the outer surface of the optical disc,
• receive a measurement of light reflected by the optical disc while the lens is in the second position, and
• determine the cleanliness of the lens based on the measurement of the light reflected by the optical disc while the lens is in the second position.