Ophthalmic device

Patent metadata

Field	Value
Publication number	US-12376743-B2
Application number	US-202217941099-A
Country	US
Kind code	B2
Filing date	Sep 9, 2022
Priority date	Sep 10, 2021
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

An ophthalmic device includes a first light source configured to output first light, a second light source configured to output second light, a first interferometer configured to acquire a first tomographic image of a first range based on first interference light, a second interferometer configured to acquire a second tomographic image of a second range based on second interference light, and a controller. The controller may be configured to perform a specific scan on a subject eye that scans the first light and the second light simultaneously in a same plane, wherein the first tomographic image and the second tomographic image are obtained by performing the specific scan, calculate an amount of distortion of the first tomographic image, correct the first tomographic image based on the amount of distortion, and correct the second tomographic image based on the amount of distortion.

First claim

What is claimed is:

1. An ophthalmic device comprising:
a first light source configured to output first light with which a subject eye is irradiated;
a second light source configured to output second light with which the subject eye is irradiated;
a first interferometer configured to acquire a first tomographic image of a first range of the subject eye based on first interference light obtained from reflected light of the first light;
a second interferometer configured to acquire a second tomographic image of a second range of the subject eye based on second interference light obtained from reflected light of the second light, the second range being different from the first range; and
a controller,
wherein
the controller is configured to:
perform a specific scan on the subject eye that scans the first light and the second light simultaneously in a same plane, wherein the first tomographic image and the second tomographic image are obtained by performing the specific scan;
perform the specific scan a plurality of times on the subject eye so that the first light and the second light pass through a specific position of the subject eye;
perform the respective specific scans radially at different positions in a circumferential direction with the specific position of the subject eye being a center;
calculate respective incident positions and incident angles of the first light at a plurality of parts included in the first range of the subject eye in the specific scan;
calculate an amount of distortion of the first tomographic image based on the respective incident positions and incident angles, and respective refractive indexes of the plurality of the parts;
correct the first tomographic image based on the amount of distortion of the first tomographic image; and
correct the second tomographic image based on the amount of distortion of the first tomographic image calculated based on the first light having entered the specific position.

2. The ophthalmic device according to claim 1 , wherein
a first optical path of the first light and a second optical path of the second light partially overlap,
the ophthalmic device further comprising:
a scanner configured to scan the first light and the second light and arranged in an overlapping section where the first optical path and the second optical path partially overlap, wherein
the controller is configured to perform the specific scan using the scanner.

3. The ophthalmic device according to claim 2 , further comprising:
a lens arranged between the scanner and the subject eye,
wherein
the first range includes an anterior segment of the subject eye,
the scanner is configured to change an incident position of the first light outputted from the first light source on the subject eye, and
the first light is scanned by the scanner so that traveling directions of the first light entering the subject eye are substantially parallel to each other.

4. The ophthalmic device according to claim 2 , wherein
the second range includes a fundus of the subject eye,
the scanner is configured to change an incident position and an incident angle of the second light outputted from the second light source on the subject eye, and
the second light is scanned by the scanner so that traveling directions of the second light entering the subject eye intersect between the scanner and the subject eye and are substantially parallel to each other inside the subject eye.

5. The ophthalmic device according to claim 1 , wherein
the controller is configured to:
calculate a position of a specific part of the subject eye from the second tomographic image; and
specify a gaze direction of the subject eye based on the position of the specific part.

6. The ophthalmic device according to claim 5 , wherein
the controller is configured to calculate an angle between an optical axis of light passing through the specific position and the specified gaze direction.

7. The ophthalmic device according to claim 1 , wherein
the controller is configured to calculate an axial length of the subject eye based on the corrected first tomographic image and the corrected second tomographic image.

Assignees

• Tomey Corp

Inventors

• Okamoto Keiichiro

Classifications

• A61B3/103

  for determining refraction, e.g. refractometers, skiascopes · CPC title

• A61B3/12

  for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) · CPC title

• A61B3/117

  for examining the anterior chamber or the anterior chamber angle, e.g. gonioscopes · CPC title

• A61B3/1005

  for measuring distances inside the eye, e.g. thickness of the cornea (A61B3/11 takes precedence) · CPC title

• A61B3/0058

  for multiple images · CPC title