The mathematical principles used to make stereo pair measurements are simple and straightforward. With a few simple tests it should be possible to determine the reliability of any software package that makes measurements on stereo pair images. Those principles are reviewed briefly here. This means a 1.4 N.A. objective has a transverse resolution of 0.22 microns and a longitudinal resolution of 9.51 microns. This is the theoretical limits of resolution.
Actual resolution is less due to other factors, such as spherical aberration and astigmatism.
1.22 N.A. Higher N.A. lenses have better transverse and longitudinal resolution. However, as can be seen from the plot, longitudinal resolution will, at best, be two times worse than transverse resolution. It is much worse for low N.A. lenses. These formulae have implications for stereo pair measurements. The best depth measurement you can make will be limited by the N.A. of the objective used.