ψ for the OPI

An implementation of the ψ algorithm of Kontsevich and Tyler[1] default parameterised for Standard Automated Perimetry based on [2] written by Andrew Turpin.

References

[1] Kontsevich and Tyler. "Bayesian adaptive estimation of psychometric slope and threshold", Vision Research 39 (1999) pages 2729--2737. DOI: https://doi.org/10.1016/s0042-6989(98)00285-5

[2] A. Turpin, D. Jankovic and A.M. McKendrick, "Identifying Steep Psychometric Function Slope Quickly in Clinical Applications", Vision Research, 50(23). November 2010. Pages 2476-2485 DOI: 10.1016/j.visres.2010.08.032