Final answer:
The provided material does not specify the correct ratio of cones in the fovea to the periphery, only that the fovea contains a high density of cones critical for high-resolution vision.
Step-by-step explanation:
The correct ratio of cones in the fovea to cones in the periphery is not specified in the provided material, and none of the ratios provided (60 to 1, 90 to 1, or 6 to 1) directly correspond to the density ratio of cones in the fovea versus the periphery. The fovea is the region with the highest concentration of cones and is the central region of the retina responsible for sharp central vision. There are about 6 million cones in the human retina, and none are present in the fovea region. It is important to remember that cones are responsible for color vision and work best in bright light, providing high-resolution vision. In contrast, the periphery of the retina contains more rods than cones, which are not as adept at color vision but are better suited for low-light conditions.