Difference between uncorrected and corrected visual acuity
Updated on version: 1.0.3


Computes de standard plot for the Journal of Refractive Surgery in order to report the Efficacy of a Procedures of Cataract Surgery by means of lines of difference in visual acuity


Difference between uncorrected and corrected visual acuity


This function calculates the standardized graph from a matrix of data of two columns:

  1. In Cataract Surgery: First column should contain the visual acuity without correction after surgery and the second column the visual acuity with correction after surgery.2  
  2. In Laser Refractive Surgery: First column should contain the visual acuity without correction after surgery and the second column the visual acuity with correction before surgery.1

In the case of procedures with multifocal intraocular lenses, the function allows to modify the labels depending on whether the data entered correspond to results of far visual acuity, intermediate or near. The function also computes the Efficacy Index as the ration between the UDVA/CDVA.3


  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.
  2. Reinstein DZ, Archer TJ, Randleman JB. JRS Standard for Reporting Astigmatism Outcomes of Refractive Surgery. J Refract Surg. 2014; 30: 654–9.
  3. Koch DD, Kohnen T, Obstbaum SA, Rosen ES. Format for reporting refractive surgical data. J Cataract Refract Surg. 1998; 24: 285–7.

Online Course

How to obtain the Toolbox?

The Refractive Analysis is an Open Source Toolbox for Matlab developed by Rodríguez-Vallejo M for the Analysis of Vision Science Results. It is freely available for the students of our online course but you need the Matlab software to use it. Matlab software is not provided with the course.

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You can enroll in the course by means of the Udemy Platform and follow the course on the same platform or through Udemy App for IOS or Android.

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Will I have a certificate once I finish the course?

When you complete the visualization of all course materials, Udemy will provide you a certificate of course completion. You will not have to take any tests to obtain this certificate, only complete the viewing of the materials.

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