The automatically dimming interior mirror contributes to greater comfort and safety when driving at night, as it prevents the driver from being dazzled by vehicles behind. It consists of a mirror element and an electronic system with two photo sensors. The electronic system detects light from in front and behind by means of photo sensors. If the amount of light from behind is greater than that from in front, the mirror is darkened accordingly. For this purpose, the surface of the mirror features a layer of electrolytes, similar to the LCD display of a mobile phone. The electrolytes consist of uniform crystals. When a voltage is applied, the crystals arrange themselves at a given angle. This angle determines how much light is reflected. The strength of the voltage determines to what extent the mirror is darkened. The darkening effect and the subsequent lightening take place almost instantly and infinitely. As the driver does not have to operate the mirror manually, his hands can remain on the steering wheel. This provides a further boost to safety.