PSYB51H3 Chapter 3: Chapter 3
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57 when one cycle subtends an angle of about 1 minute of arc (0. 017 degree: this resolution acuity represents one of the fundamental limits of spatial vision: it is the nest high- contrast detail that can be resolved. As a result, visual acuity is much poorer in the periphery than in the fovea. Most healthy young adults have an acuity level closer to 20/15. The csf reaches this value at about 60 cycles/degree, which corresponds to a cycle width of 1 minute of arc, the resolution limit we measured previously for high-contrast stripes (which is determined primarily by cone spacing). However, the falloff in the csf on the other side of the curve must be due to neural factors. So, there would be no net difference between the light intensity of the center and the surround. The bottom two layers have cells that are physically larger than the upper layers, and therefore are called the magnocellular layers.
