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- Hello, and welcome to Lets Learn about the Optical Cross. I know this is something that a lot of you struggle with. It is probably one of the most popular emails that I get. Lets see if I cant clear up some of the mysteries and make life a little bit easier for you. (upbeat music) One way were gonna do that first is take a moment and learn one of my favorite optical chants. And it is this, the shorter the radius, the steeper the curve. The steeper the curve, the higher the power. The higher the power, the thicker the lens. Itll never let you down, and become particularly helpful if you get into contact lenses. So lets review that one more time. The shorter the radius, the steeper the curve. The steeper the curve, the higher the power. The higher the power, the thicker the lens. Put that up there, and make sure you keep it there. If I took these numbers. And I pushed you a little bit. I said, what is that five? What is that two? What is that seven? You may come up with all kinds