Method for determining the acceptance of progressive addition lenses. Granger, B. & Alvarez, T. L. August~26, 2014. US Patent 8,814,361
bibtex   
@misc{granger2014method,

  title={Method for determining the acceptance of progressive addition lenses},

 author={Granger, B{\'e}rang{\`e}re and Alvarez, Tara Lynn},

  year={2014},

  month=aug # "~26",

  note={US Patent 8,814,361}

}

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