Patent ID: 9039183
Filing Date: 2015-05-26
Classification: A61B

Abstract:
1. A method of determining a correction for distortion in eye representations of an ophthalmoscope comprising: (i) constructing a digital model of an optical system comprising the ophthalmoscope and a model eye, (ii) transmitting the digital model of the optical system to a ray tracing system and passing a ray through the optical system onto a surface of the model eye of the digital model, (iii) calculating a first measurement of the ray, with distortion, at the surface of the model eye, (iv) determining an angular position of a horizontal scanning element of the ophthalmoscope used to produce the ray and an angular position of a vertical scanning element of the ophthalmoscope used to produce the ray, (v) determining a horizontal scanning angle of the optical system and a vertical scanning angle of the optical system for the ray based on the angular position of the horizontal scanning element and the angular position of the vertical scanning element, (vi) calculating a second measurement of the ray at the surface of the model eye, without distortion, using the horizontal scanning angle of the optical system and the vertical scanning angle of the optical system, and (vii) comparing the first measurement, with distortion, of the ray at the surface of the model eye with the corresponding second measurement, without distortion, of the ray at the surface of the model eye to determine the correction for distortion in eye representations of the ophthalmoscope.