US 11,849,997 B2
Apparatus and method for determining the refractive error of an eye
Nikolai Suchkov, Tübingen (DE); Alexander Leube, Aalen (DE); and Siegfried Wahl, Donzdorf (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Mar. 10, 2023, as Appl. No. 18/181,671.
Application 18/181,671 is a continuation of application No. PCT/EP2021/000112, filed on Sep. 24, 2021.
Claims priority of application No. 20 198 056 (EP), filed on Sep. 24, 2020.
Prior Publication US 2023/0210361 A1, Jul. 6, 2023
Int. Cl. A61B 3/103 (2006.01); A61B 3/00 (2006.01); A61B 3/032 (2006.01); A61B 3/09 (2006.01); A61B 3/14 (2006.01); A61B 3/18 (2006.01)
CPC A61B 3/103 (2013.01) [A61B 3/0025 (2013.01); A61B 3/032 (2013.01); A61B 3/09 (2013.01); A61B 3/14 (2013.01); A61B 3/18 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus for determining a refractive error of an eye, the apparatus comprising:
an illumination device;
an aperture device configured to provide at least three different apertures and configured to receive light coming from the eye through the at least three different apertures of the aperture device; and
a detector device configured to measure an intensity of the light coming from the eye through each of the at least three different apertures of the aperture device,
wherein the at least three different apertures are provided in at least three different locations simultaneously and include a first aperture with a first slit-shaped opening having a longitudinal direction of the slit in a horizontal direction with respect to the eye, a second aperture with a second slit-shaped opening being arranged at an angle of 45° with respect to the longitudinal direction of the first slit-shaped opening, and a third aperture with a circular opening, and wherein the detector device includes separate detectors for each of the at least three different apertures.