Factor. 
Definitions:
Opponent-process Theory
A psychological and neurological model that explains a wide range of behaviors, including color vision and emotions, by proposing that opposing processes operate within the body to maintain balance.
Young-Helmholtz Theory
A theory of color vision that proposes the eye contains three types of color receptors sensitive to red, green, and blue.
Fovea
The central portion of the retina, where visual acuity (sharpness of vision) is highest.
Cones
Photoreceptor cells in the retina of the eye that function best in relatively bright light and enable the perception of color.
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