Estimation of the visual acuity based on SweepVEP and a modified Ricker model

 or 

Subjective VA (decimal):

Modified Ricker model
Lock scale 		$$a(sf) = (a_{max} - a_{noise}) {sf} / {{sf}_{max}} {e^({{-{sf}/{{sf}_{max}} + 1}}) + a_{noise}$$
n
RMSEμV
amaxμV
sfmaxcpd
anoiseμV
SNRdB
SNRmindB
sfthresholdcpd

predicted VA (decimal)
sfmax:
sfthreshold:
2nd-order polynomial model
Lock scale 		$$a(sf) = p_1 + p_2{log_{10}(sf)} + p_3{log_{10}(sf)}^2$$
n
coefficients
[p1, p2, p3]
R2
RMSEμV
sfvertexcpd
sflimitingcpd

predicted VA (decimal)
sfvertex:
sflimiting:
This project uses the following open source libraries:
  • fminsearch: Multiparametric nonlinear regression in javascript.
  • Function Plot: A 2d function plotter powerd by D3.js
  • jqMath: Put Math on the Web
  • jQuery: Fast, small, and feature-rich JavaScript library
  • DataTables: Plug-in for the jQuery. A highly flexible tool, that adds all of these advanced features to any HTML table.
  • LambertW: Javascript implementation of Lambert W function
  • PapaParse: Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input
  • Regression-js: A javascript library containing a collection of least squares fitting methods
  • rmse: Various functions for calculating root mean square error (RMSE) and mean square error (MSE)
  • Lodash: A modern JavaScript utility library delivering modularity, performance & extras

Disclaimer

This is a Free and Open Source Software (FOSS) licensed under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This software is not certified as a medical device (CE-1 or FDA) for primary diagnosis or clinical practice. This software can only be used as a reviewing or scientific software and cannot be used as a medical device for primary diagnostic or any other clinical practice.

This is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details (cf. GNU General Public License version 3).

Copyright © 2018 Torsten Straßer, Institute for Ophthalmic Research, Tuebingen, Germany