Effect of optical defocus on detection and recognition of vanishing optotype letters in the fovea and periphery.

@article{Shah2012EffectOO,
  title={Effect of optical defocus on detection and recognition of vanishing optotype letters in the fovea and periphery.},
  author={Nilpa Shah and Steven C. Dakin and Roger S. Anderson},
  journal={Investigative ophthalmology & visual science},
  year={2012},
  volume={53 11},
  pages={
          7063-70
        }
}
PURPOSE Vanishing optotypes (VOs) are pseudo high-pass letters whose mean luminance matches the background so that they "vanish" when the recognition acuity threshold is reached in the fovea. We determined the effect of increasing blur on acuity for these optotypes and conventional letters, in both foveal and extrafoveal viewing. METHODS Detection and recognition thresholds were determined separately for each of the 26 letters of both a conventional and VO alphabet, both in the fovea and at… CONTINUE READING

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