Thickness change with accommodation. (A) Thickness of the crystalline lens, nucleus, and the anterior and posterior cortex as a function of back vertex power for all lenses. Black lines represent linear fits to the data: total thickness (mm) = 2.070 + 0.035 × lens power (D); nucleus thickness (mm) = 1.576 + 0.0239 × lens power (D); anterior cortex thickness = 0.202 + 0.005 × lens power (D); and posterior cortex thickness = 0.291 + 0.007 × lens power (D). (B) Rate of change of the thickness of the lens, anterior cortex, nucleus, and posterior cortex of the lens.