A blue light filter is a technology designed to reduce the amount of blue light emitted by electronic devices, such as computer screens, smartphones, and televisions. Blue light is a type of high-energy visible (HEV) light that has been linked to disrupted sleep patterns, eye strain, and headaches. Blue light filters work by blocking or reducing the amount of blue light emitted by electronic devices and replacing it with warmer, more natural light. This can help to reduce symptoms associated with prolonged exposure to blue light and improve sleep quality. Blue light filters can be built into electronic devices or added as a separate software or hardware solution.

The ORBEYE surgical exoscope system with a blue light filter is a powerful imaging tool for 5-ALA fluorescence-guided surgery of Glioblastoma. The ORBEYE blue filter performs optimally at shorter focal distances with moderate light intensity. Similar to microscope systems, decreasing focal distance significantly influences visualized fluorescence ¹⁾.