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The ability of the muscles in the eye to bend or focus the lens deteriorate with age as the elasticity hardens I am farsighted with 20 20 vision ,the plus correction was for I used to be 20 10 vision farsighted (I shoot rifle matches and when my eyes weakened to 20 20 I missed that extra advantage for far away targets ) this plus correction brought me back to 20 10 vision ,now with out correction lens I'm up to 20 15 a significant improvement ,not quite 20 10 but getting there.