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Producing high quality AR/VR/MR headsets require high-resolution, 100% visual defect detection at each critical process stage from IQC (glass wafers) through coating and assembly (final QC). Particles and coating defects of only a few microns can mean a rejected assembly. Dark Field has developed and proven on-line, high-speed inspection and measurement technologies which detect defects and provide real time measurements and immediate grading/alarms/reject actions.