 Then you repeat the cold and hot cycle for 5 to 10 minutes for optimal recovery. I'm John Tesh with today's Intelligence for Your Life Minute. KFNX Cave Creek. Phil Brady with Dr. Kopstein from K2 Vision RLE. Doc, is it true 50% of Americans have their lenses replaced by the time they're 75? That's exactly right. As we near 50, our eye's natural lens starts to become dysfunctional. If you've now added readers to your need for glasses and contacts,