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| Letters-in-Noise Chart. Click to enlarge. |
Letters-in-Noise Chart
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Pelli, D. G., & Hoepner,
J. A. (1989) Letters in noise: A visual test chart that “bypasses” the
optics. In: Noninvasive Assessment of the Visual System, 1989 Technical
Digest Series, 7 (pp. 103-106). Washington, DC: Optical Society of America. 
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