Why is the D-shape design of the Audi 80's headlights more effective?

I've noticed that some Audi 80 models have rectangular headlights while others have a unique D-shape design. What is the purpose and advantage of this specific headlight design compared to traditional rectangular headlights?

The D-shape design of the Audi 80's headlights is more effective because it provides a wider and more concentrated beam of light, allowing for better visibility on the road at night or during inclement weather. Additionally, the shape of the headlights helps to reduce glare for other drivers, making for a safer driving experience overall.

The D-shape design of the Audi 80's headlights is actually inspired by the shape of human eyes, which have a wider peripheral vision. This allows for better coverage and visibility on the road, contributing to improved safety while driving.