US 12,136,237 B2
Apparatus for calibrating retinal imaging systems
Eric L. Buckland, Hickory, NC (US)
Assigned to Translational Imaging Innovations, Inc., Hickory, NC (US)
Filed by Translational Imaging Innovations, Inc., Hickory, NC (US)
Filed on Jan. 4, 2022, as Appl. No. 17/568,306.
Claims priority of provisional application 63/133,897, filed on Jan. 5, 2021.
Prior Publication US 2022/0215584 A1, Jul. 7, 2022
Int. Cl. A61B 3/00 (2006.01); A61B 3/12 (2006.01); G06T 3/40 (2024.01); G06T 7/00 (2017.01); G06T 7/60 (2017.01); G06T 7/80 (2017.01); G09B 23/28 (2006.01)
CPC G06T 7/80 (2017.01) [A61B 3/0025 (2013.01); A61B 3/12 (2013.01); G06T 3/40 (2013.01); G06T 7/0012 (2013.01); G06T 7/60 (2013.01); G09B 23/286 (2013.01); G06T 2207/30041 (2013.01); G06T 2207/30204 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A model eye for calibrating a retinal imaging system, the retinal imaging system including a centered optical imaging system having first and second converging optical elements, an aperture stop of fixed or variable diameter D1 characterized by an optical axis, a nodal point, a focal plane, and a field of view (2θ), the model eye comprising:
a backplane having a negative radius of curvature R centered on the optical axis and a clear aperture diameter D2;
a distance h along the optical axis from the nodal point to the backplane;
an unobstructed field of view 2θ, where θ is an angle measured from the optical axis at the nodal point to an edge of the backplane at a radial limit of a clear aperture;
a housing for enclosing elements of the model eye;
a mechanical system for mounting, aligning, and preserving spacings of the elements of the model eye in the housings; and
a pattern applied to the backplane, the pattern having a rotational symmetry and a radial repeating unit, extending substantially across the clear aperture, that spatially modulates intensity of light reflected from, or transmitted through, a surface of the backplane,
wherein D2/D1 is greater than 2, an absolute value of R/h is greater than 0.5, and 2θ is greater than zero (0) degrees.