US 11,779,206 B2
Axial length measurement monitor
Ryo Kubota, Seattle, WA (US); Philip M. Buscemi, Mount Pleasant, SC (US); Matthias Pfister, Liebefeld-Bern (CH); Stephan Wyder, Bern (CH); and Amitava Gupta, Roanoke, VA (US)
Assigned to ACUCELA INC., Seattle, WA (US)
Filed by ACUCELA INC., Seattle, WA (US)
Filed on Sep. 28, 2022, as Appl. No. 17/936,263.
Application 17/936,263 is a continuation of application No. 17/647,585, filed on Jan. 10, 2022, granted, now 11,497,396.
Claims priority of provisional application 63/200,718, filed on Mar. 24, 2021.
Prior Publication US 2023/0026753 A1, Jan. 26, 2023
Int. Cl. G01B 9/02 (2022.01); A61B 3/10 (2006.01); G01B 9/02091 (2022.01)
CPC A61B 3/102 (2013.01) [G01B 9/02091 (2013.01); G01B 2290/45 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system measuring a change in a refractive error of an eye, the system comprising:
a swept light source to generate a light beam and vary a wavelength of the light beam;
a scanner comprising a mirror coupled to the swept light source to simultaneously scan a measurement beam along a corneal zone of the eye and a retinal zone of the eye;
an interferometer coupled to the swept light source and the scanner, the interferometer comprising a measurement optical path and a reference optical path to generate a first plurality of A-scans of the corneal zone and the retinal zone at a first time and a second plurality of A-scans of the corneal zone and the retinal zone at a second time, wherein the first plurality of A-scans and the second plurality of A-scans are generated with a zero point of the measurement optical path and the reference optical path located between a lens of the eye and a retina of the eye;
a detector coupled to the interferometer to receive the first plurality of A-scans and the second plurality of A-scans from the interferometer; and
a processor coupled to the detector, the processor configured with instructions to determine a first axial length of the eye in response to the first plurality of A-scans, a second axial length of the eye from the second plurality of A-scans, and the change in refractive error in the eye, wherein the change in refractive error corresponds to a difference between the first axial length and the second axial length.