Can someone tell me if I am understanding this right? If not, can you clarify?
This is how I understood it:
They don't have different cones cells for detecting color. Instead, their pupil is more like a slit, causing light to be diffracted, not unlike a prism. Because of the diffraction, different wavelengths of light fall on different areas of the retina. Their brain is mapped as such that they understand the location of the light as the color. Moving the eye around helps them refine this information.
This is how I understood it:
They don't have different cones cells for detecting color. Instead, their pupil is more like a slit, causing light to be diffracted, not unlike a prism. Because of the diffraction, different wavelengths of light fall on different areas of the retina. Their brain is mapped as such that they understand the location of the light as the color. Moving the eye around helps them refine this information.