1. An optical evaluation workstation comprising: an eyecup assembly feeder configured to receive an eyecup assembly of a head mounted display (HMD), the eyecup assembly comprising an optics block and an electronic display panel, and the electronic display panel presenting one or more test patterns; a camera assembly configured to capture one or more images of the one or more test patterns presented by the electronic display panel through the optics block, the camera assembly comprising a pinhole aperture at an exit pupil of the eyecup assembly and a camera; and a control module configured to determine one or more virtual image distances (VIDs) of the eyecup assembly using the plurality of images captured by the camera assembly, wherein a virtual image distance is a distance from a position of the exit pupil to a virtual image of the electronic display panel, as viewed through the optics block, wherein a virtual image is an image produced in a plane where rays of light appear to, but do not actually, converge behind the electronic display panel, and wherein the determined VID is used to automatically pair up eyecup assemblies with similar VID values.