The resolution of the display is the crucial component that affects the level of details perceived by human eyes. In AR headsets, the useful metric for resolution is pixels per degree (PPD). It is the number of pixels per degree it present to the eye, the number of pixels in the horizontal display line has to be divided by the horizontal field of view provided by the optics of the headset (lens). E.g. In a display with 1280 x 800 px, the pixels per eye are 640 x 800 px, and with a FOV of 90 degrees the PPD comes out to be 7.1 (640/90). This is way too low as compared to the retina resolution of the eye, the PPD of the human fovea is approximately 60 PPD.