Auto Dimming ORVMs – Feature Explained

What Is Auto Dimming ORVMs?

Auto dimming ORVMs are exterior rearview mirrors that automatically adjust their reflectivity to reduce glare from bright lights, particularly from the headlights of vehicles following behind. This technology prevents the driver from being temporarily blinded, improving overall visibility and reaction time.

How Do Auto Dimming ORVMs Work?

The magic behind auto dimming ORVMs lies in their intelligent sensor system and electrochromic technology:

1. Dual Light Sensors: The mirror incorporates 2 light sensors. One sensor faces forward, detecting ambient light levels, while the other faces backward, detecting light from vehicles behind.
2. Light Difference Detection: When the rear-facing sensor detects bright light (headlights) and the front-facing sensor detects low ambient light (indicating it;s dark outside), the system recognises a glare situation.
3. Electrochromic Dimming: Upon detecting glare, an electric current is applied to an electrochromic gel or liquid sandwiched between 2 layers of glass within the mirror. This gel darkens in response to the electrical charge, reducing the amount of light reflected into the driver’s eyes.
4. Automatic Adjustment: The system continuously monitors light levels and adjusts the mirror’s tint in real-time. When the glare reduces (the bright lights pass), the current is reduced or removed, and the mirror returns to its normal, clear state.

What Are The Pros And Cons Of Auto Dimming ORVMs?

Here are the pros, or advantages, of Auto Dimming ORVMs:

• Enhanced Night Safety: Significantly reduces glare from following vehicles, preventing temporary blindness and improving the driver’s ability to see the road and surroundings.
• Reduced Driver Fatigue: Less eye strain during night driving leads to a more comfortable and less fatiguing experience.
• Convenience: Eliminates the need for manual mirror adjustments or flipping a lever, allowing the driver to focus solely on the road.
• Premium Feature: Adds a touch of sophistication and advanced technology to the vehicle.

Here are the cons, or disadvantages, of Auto Dimming ORVMs:

• Added Cost: This feature typically comes in higher variants or as an optional extra, increasing the vehicle’s price.
• Potential for Delay: Although modern systems are very quick, there might be a slight delay (milliseconds) in the mirror dimming or brightening.
• Limited Effectiveness In Certain Scenarios: Extremely bright, off-angle lights might still cause some discomfort before the mirror fully adjusts.

Can Auto Dimming ORVMs be installed from the aftermarket?

While aftermarket auto-dimming inside rearview mirrors (IRVMs) are relatively common and can be installed, adding auto-dimming functionality to ORVMs is more complex. It often involves replacing the entire mirror assembly, which can be costly and may require specialised wiring and integration with the vehicle’s existing electrical system. Professional installation is highly recommended for such modifications to ensure proper functionality and safety.

Affordable Cars In India That Offer Auto Dimming ORVMs?

Auto dimming ORVMs are becoming more prevalent across various segments in India, moving beyond just luxury cars. While often found in top-end variants, here are a few examples of affordable cars (typically their higher trims) that offer this feature:

• Hyundai Creta: Higher variants often include auto-dimming ORVMs.
• Kia Seltos: Similar to the Creta, its the Seltos’ top variants offer this feature.
• Honda City: Premium variants of this popular sedan come equipped with auto-dimming ORVMs.
• Tata Nexon: Select higher-end variants of this compact SUV may also feature auto-dimming ORVMs.

The availability can vary based on the specific model year and variant, so it’s always advisable to check the latest specifications from the manufacturer or dealership.

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