The auto-brightness function allows you to benefit from an adaptive display while using your ENGO Smart Eyewear. The sensor located on top of the left lens of your glasses measures the light surrounding you in order to regulate the level of brightness on the lens. This functionality is activated and deactivated in the ActiveLook app.
If you believe the auto-brightness is malfunctioning (IE the screen is blinking, the level of brightness isn't changing) go into the app and disable then enable the function. You may also want to turn your glasses off and then back on. If the problem persists, close the app, and then try the previous steps once more.