The slope of the psychometric function for Bailey-Lovie letter charts: defocus effects and implications for modeling letter-by-letter scores.

@article{Carkeet2001TheSO,
  title={The slope of the psychometric function for Bailey-Lovie letter charts: defocus effects and implications for modeling letter-by-letter scores.},
  author={Andrew Carkeet and Lucas Lee and Jonathan R. Kerr and Man Keung},
  journal={Optometry and vision science : official publication of the American Academy of Optometry},
  year={2001},
  volume={78 2},
  pages={113-21}
}
BACKGROUND Visual acuity measurement often results in an imprecise endpoint because subjects correctly identify some but not all of the letters on one or more size levels on a letter chart. The extent of this transition zone from seeing to nonseeing can be described by probit size, which is calculated by performing Probit Analysis on letter chart data. There has been no previous research into the effects of optical defocus on letter chart probit size. METHODS We tested 18 young visually… CONTINUE READING

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