sentence: There's an optometrist seated with his patient in front of a phoropter in his clinic, talking about contact lenses and its maintenance. sentence:  He explains what are the correct ways to put on contact lenses and also how to keep them clean. sentence:  A woman is demonstrating how to correctly wear lenses in the eyes as she takes the lenses out of the case. sentence:  Then the doctor also demonstrates how to correctly wear the lenses. sentence:  The optometrist continues to explain how to store the lenses in the case to increase its life and durability.