In Zemax, I am trying to simulate a refractive bifocal IOL having 0 D and 3 D power using Liou Brennan's eye model for a 5 mm pupil diameter where light comes from the cornea to the retina. Now, in the through-focus MTF pannel, the focus shift is in the millimeter unit, although, in most of the research articles, MTF variation is shown in the diopter. How do I know that the created phase map is correct ( meaning that I am getting the 3-diopter power correctly from the MTF map. Please help. Thank you.
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/fc32e192-aea0-4c3b-bb02-fd99d723befc.png)