The ATG function was designed to improve the Bright-Source Protection (BSP) feature to be faster and to keep the best resolution and contrast at all times. It is particularly suitable for aviator's night-vision goggles, operations in urban areas or for special operations. ATG is a unique feature that operates constantly, electronically reducing the “duty cycle” of the photocathode voltage by very rapidly switching the voltage on and off. This maintains the optimal performance of the I² tube, continuously revealing mission-critical details, safeguarding the I² tube from additional damage and protecting the user from temporary blindness.