Why Do Humans Have 3 Cones

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Recommended: The eye chapter 8 anatomy and physiology

Humans have 3 cones in their retina. A cone is a photoreceptor cell that is primarily responsible for visual acuity or sharpness that determines how well we see and also detect color. Dogs have only 2 cones. They do not have the red photoreceptor cone which becomes a reason for them to perceive shades of red as shades of yellow. The hues of a color (for example: light yellow and brownish yellow) is a discriminating factor for canines to identify two objects

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