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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Semin Pediatr Neurol. 2019 May 11;31:30–40. doi: 10.1016/j.spen.2019.05.006

Figure 2:

Figure 2:

Example Contrast Sensitivity Function. Contrast increases from top to bottom and spatial frequency increases from left to right most observers perceive an inverted U shape that separates visible from non-visible letters, illustrated by the dashed line. Adapted from24).