Which of the following is a major resonance contributor to the first structure? 
Definitions:
Blind Spot
Area in the retina where the axons of the three layers of retinal cells exit the eye to form the optic nerve; insensitive to light.
Fovea
A small depression in the retina of the eye where visual acuity is highest, due to the high concentration of cones and absence of rods.
Saturation
In color theory, saturation refers to the intensity or purity of a color; in psychology, it can relate to the degree of intensity of a feeling or experience.
Brightness
The perception of how luminous or vivid a light source appears to an observer, which can vary greatly under different conditions of illumination and viewing.
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