* Fox Vision: Foxes have good vision, but it's different from human vision. They are dichromats, meaning they see in two primary colors (likely blue and green) compared to humans who are trichromats (seeing red, green, and blue).
* Red Light: Red light has a longer wavelength than other colors visible to humans. This means that foxes might see it less brightly or even as a dull shade, similar to how humans struggle to see red in dim lighting.
* Lens Color: The color of the lens doesn't change the actual color of the light passing through it. It simply filters out other wavelengths, allowing primarily red light to pass.
In summary:
* It's likely foxes can see some light passing through a red lens, but it might appear much dimmer and less distinct than to humans.
* They might not perceive the color as "red" in the same way we do, but rather as a darker or duller hue.
To know for sure, we would need further research on fox color perception and how they react to specific wavelengths of light.