Yes, the Sun is still very bright on Mars, and it can be damaging to the eyes if directly observed without appropriate protection. Although the atmosphere on Mars is much thinner than Earth's atmosphere, sunlight on Mars is still quite intense due to the planet's proximity to the Sun. In fact, Mars is closer to the Sun than Earth, which means the solar radiation reaching its surface is relatively strong.
When observing the Sun from Mars, it is crucial to use proper eye protection, just as it is on Earth. Staring directly at the Sun can lead to permanent eye damage or even blindness. Specialized solar filters or eclipse glasses should be used to safely view the Sun, as these tools can block the harmful ultraviolet (UV) and infrared (IR) radiation emitted by the Sun.
NASA's rovers and landers that have been sent to Mars are equipped with cameras and instruments designed to study the Sun and its effects on the Martian environment. These instruments have built-in protective filters to safely observe the Sun's activity without damaging the equipment.