# US 2013/0258282 A1 · Ophthalmologic apparatus

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- Number: US 2013/0258282 A1
- Document ID: US20130258282A1
- Status: Published application
- Kind: A1
- Application number: 13/850,982
- Filed: 2013-03-26
- Published: 2013-10-03
- Earliest claimed: 2012-03-30
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Atsushi Goto; Kazuhide Miyata; Makoto Sato; Tomoyuki Makihira; Yoshihiko Iwase; Kazuro Yamada; Ritsuya Tomita; Yohei Minatoya; Daisuke Kibe; Hiroyuki Shinbata
- Web page: https://patentgrep.com/patent/US20130258282A1

## CPC

- A61B 3/1005: {for measuring distances inside the eye, e.g. thickness of the cornea (A61B3/11 takes precedence)}
- A61B 3/0041: {characterised by display arrangements}
- A61B 3/102: {for optical coherence tomography [OCT]}
- A61B 3/1025: {for confocal scanning}
- G06T 7/0012: {Biomedical image inspection}
- G06T 7/62: of area, perimeter, diameter or volume
- G06T 2207/10101: Optical tomography; Optical coherence tomography [OCT]
- G06T 2207/20032: Median filtering
- G06T 2207/30041: Eye; Retina; Ophthalmic
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

An ophthalmologic apparatus includes an obtaining unit configured to obtain an anterior segment image of a subject's eye, a tomographic image obtaining unit configured to obtain a tomographic image of an anterior segment of the subject's eye, a calculation unit configured to calculate a thickness of a cornea based on the tomographic image, and a display control unit configured to cause a display unit to display the anterior segment image, a closed curve on the anterior segment image, and a smallest thickness of the cornea among thicknesses of the cornea in a portion where the closed curve lies.

## Claims

### Claim 1

An ophthalmologic apparatus comprising:
an obtaining unit configured to obtain an anterior segment image of a subject's eye;
a tomographic image obtaining unit configured to obtain a tomographic image of an anterior segment of the subject's eye;
a calculation unit configured to calculate a thickness of a cornea based on the tomographic image; and
a display control unit configured to cause a display unit to display the anterior segment image, a closed curve on the anterior segment image, and a smallest thickness of the cornea among thicknesses of the cornea in a portion where the closed curve lies.

### Claim 2 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the closed curve is a circle around a center of a pupil of the subject's eye or around an apex of the cornea.

### Claim 3 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the display control unit is configured to cause the display unit to display a display pattern to indicate a position where the cornea has the smallest thickness among the thicknesses of the cornea in the portion where the closed curve lies.

### Claim 4 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the display control unit is configured to cause a display pattern indicating a position where the cornea has the smallest thickness among the thicknesses of the cornea in the portion where the closed curve lies to be displayed on the anterior segment image.

### Claim 5 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the tomographic image obtaining unit comprises:
an illumination optical system configured to guide light emitted from a light source to the subject's eye;
a control unit configured to sweep wavelength of the light emitted from the light source;
an imaging optical system configured to guide return light of the light swept by the control unit, returning from the subject's eye, to an imaging unit; and
a tomographic image generation unit configured to generate the tomographic image based on an output of the imaging unit.

### Claim 6 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the display control unit is configured to cause the display unit to display a graph indicating the thicknesses of the cornea in the portion where the closed curve lies with respect to positions on the closed curve.

### Claim 7 (depends on 1)

The ophthalmologic apparatus according to claim 1, wherein the display control unit is configured to cause the display unit to display an area accepting an input from an input unit, and cause the closed curve to be displayed on the anterior segment image in a size according to the input to the area.