TechnoTeam provides a range of near-eye-display (NED) lenses with a front-stop aperture design. These lenses are used to measure the characteristics of AR/VR/MR eyewear display devices with our imaging LMK photometer/colorimeter. They all have an external entrance pupil with diameters ranging from 2 mm to 6 mm, according to the IEC 63145 series for wearable NED devices and the IDMS (Information Display Measurements Standard' section 19 v1.2b). This ensures that the lens entrance pupil is always placed at the designed eye position of the NED. In this way, the LMK imitates the human observer's optical imaging when measuring the NED.