"spheEquiv" function. Predictability of postoperative spherical equivalent refraction

This function computes the Predictability by means of a plot that shows the percentage of eyes for different ranges of residual refractive error according to the Standard for Reporting Refractive Outcomes. 

This graph is required for all studies, including those in cataract populations. The correct way to analyze the data is to adjust the residual spherical equivalent according to the target refraction expected when IOL power is computed. Anyway, the function also allows to compute the plot without this correction (not recommendable).

Examples:

Cataract surgery:

  • [stat]=spheEquiv(SPHE,1,'en',target). Correcting the target spherical equivalent.
  • [stat]=spheEquiv(SPHE,1,'en'). Without correcting the target spherical equivalent.

Below you have the help of the function. For more information about "refractiveAnalysis" Toolbox please Contact the author

%   Computes the plot Spherical Equivalent Refractive Accuracy or Predictability of the procedure
%
%   DESCRIPTION
%
%   Computes de Figure C from the standard of the JRS
%   Reinstein DZ, Archer TJ, Srinivasan S, et al. Standard for Reporting Refractive Outcomes of Intraocular Lens–Based Refractive Surgery. J Refract Surg. 2017; 33: 218–22. 
%
%   PARAMETERS
%
%   SPHE      Equivalent sphere vector data
%   month     Months after surgery
%   language  Language for the labels 'es' for Spanish or 'en' for English
%   target    Vector data for the target refractive error after computing
%             the IOL power (optional but recommended)
%
%   RETURN
%
%   stat     stat=[mean, standard deviation, median, interquartile range]
%             for the spherical equivalent
%   EXAMPLE
%
%   [stat]=spheEquiv(SPHE,1,language,target) //Correcting the target
%                                               spherical equivalent
%   [stat]=spheEquiv(SPHE,1,language)//Without correcting the target
%
%   VERSION
%   
%   1.0.0
%   demo data "residual.mat"

Referencias

  1. Reinstein DZ, Archer TJ, Srinivasan S, et al. Standard for Reporting Refractive Outcomes of Intraocular Lens–Based Refractive Surgery. J Refract Surg. 2017; 33: 218–22.