Visual acuity is better for letters in rows than in columns

@article{Freeman1980VisualAI,
  title={Visual acuity is better for letters in rows than in columns},
  author={Ralph D. Freeman},
  journal={Nature},
  year={1980},
  volume={286},
  pages={62-64}
}
The spatial resolving capacity of the visual system is usually measured with charts containing letters of different sizes displayed in horizontal rows or, less often, in vertical columns. Although previous studies suggest that acuity may not be equal for these two arrangements1–7 it is implicitly assumed in clinical tests that orientation of an array of letters is of no consequence to the measurement. The work reported here shows that this assumption is incorrect. While undergoing an… CONTINUE READING

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