1. A method for evaluating a lens assembly, the method comprising the steps of: providing a test chart; providing a capturing system; capturing a test chart image of the test chart with the capturing system using the lens assembly to focus light onto the capturing system; selecting a first image area from the test chart image; dividing the first image area into a plurality of first area blocks; and estimating a first area optics point spread function of the first image area using a PSF cost function that sums the fidelity terms of at least two of the first area blocks.