A Blue Light Filter is a feature found in many electronic devices, such as smartphones, tablets, and computers. It helps reduce the amount of blue light emitted from screens, which can cause eye strain and disrupt sleep patterns. By filtering out this high-energy light, users can enjoy a more comfortable viewing experience, especially during the evening. Many people use blue light filters to protect their eyes while working or browsing online for extended periods. Some devices have built-in settings, while others may require downloading an app. Overall, a blue light filter is a simple way to promote better eye health and improve sleep quality.