Finally, I have to submit to age and get progressive lenses (multifocals) for my glasses. Haven't got them yet, but the optometrist cautioned me that it will take a while to adjust. She also said I should probably use my existing glasses for tennis otherwise the distant to near ball transitions could cause a problem. Tell me how long it takes to get used to progressives. Should you drive imediately after you get them or use the old ones for a while? What are the issues? What did you do for tennis?