Which of the following would have a trigonal planar (or triangular) structure? 
Definitions:
Color Vision
The ability of the eye to distinguish objects based on the wavelengths of light they reflect, emit, or transmit.
Lens
In optics, a lens is a transparent device that refracts or bends light rays to focus them, used in glasses, cameras, and various instruments for magnification or correction.
Fovea
A tiny indent in the eye's retina that features the greatest visual sharpness because of a high density of cones.
Retina
The light-sensitive layer of tissue at the back of the inner eye, converting light signals into neural signals for vision.
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