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. Author manuscript; available in PMC: 2009 Nov 5.
Published in final edited form as: Vision Res. 2008 Sep;48(19):1929–1939. doi: 10.1016/j.visres.2008.06.021

Figure 3.

Figure 3

The maximum and minimum cone excitation for L- (dotted line), M- (solid line), and S-cones (dashed line), for an imaginary 10 c/d sine wave stimulus with 100% contrast when the focal plane is either at 420 nm (left) or 600 nm (right), and the peak of the M-cone extinction spectrum is at 460 nm (top), 500 nm (middle) or 560 nm (bottom), and the effects of LCA have been taken into consideration. L- and M-cone contrast increases when the focal plane is at 600 nm and decreases at 420 nm. S-cone contrast increases when the focal plane is at 420 nm. As the M-cone peak is shifted towards longer wavelengths (top to bottom) until it is aligned with the L-cone, the cone excitation spectrum follows.