US 12,484,777 B2
Ophthalmic apparatus and method of alignment of ophthalmic apparatus
Ilkka Alasaarela, Oulu (FI)
Assigned to Optomed Plc, Oulu (FI)
Filed by Optomed Plc, Oulu (FI)
Filed on Oct. 27, 2023, as Appl. No. 18/496,208.
Claims priority of application No. 20225964 (FI), filed on Oct. 28, 2022.
Prior Publication US 2024/0138677 A1, May 2, 2024
Int. Cl. A61B 3/14 (2006.01); A61B 3/00 (2006.01); A61B 3/12 (2006.01); A61B 3/15 (2006.01); G06T 7/00 (2017.01)
CPC A61B 3/14 (2013.01) [A61B 3/0025 (2013.01); A61B 3/12 (2013.01); A61B 3/152 (2013.01); G06T 7/0012 (2013.01); A61B 2560/02 (2013.01); G06T 2207/30041 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An ophthalmic apparatus, wherein the ophthalmic apparatus comprises
an illumination channel for illuminating a retina of an eye in response to a distance between the ophthalmic apparatus and the eye being within a working range of the ophthalmic apparatus;
an imaging channel for collecting light reflected from the retina;
an image capturing arrangement for capturing images of the retina through the imaging channel while the distance between the ophthalmic apparatus and the eye is within a working range of the ophthalmic apparatus; and
a chromatic arrangement configured to cause and/or imitate a longitudinal chromatic aberration of an optical spectrum of light directed toward an eye while a longitudinal aberration range is at least partially overlapping with a frontal section of an eye between an outer surface of a cornea and a rear surface of a crystalline lens of a standard eye in response to a distance between the ophthalmic apparatus and the eye being within a working range of the ophthalmic apparatus;
a collection optics configured to collect at least portion of the light reflected from the frontal section of the eye, and focus the light to a collection aperture or slit;
an optical spectrum analyzer; configured output signals, a single signal of the signals carrying information on intensity of a single wavelength band of the different wavelength bands; and
a data processing unit configured to measure one or more intensities carried by at least one of the signals and determine a distance and/or a need for adjustment of the distance between the ophthalmic apparatus and the eye based on at least one peak intensity of the signals, peaks being caused by reflections from at least one surface of the eye.