Ophthalmic apparatus

An ophthalmic apparatus comprising:

• a scanning unit configured to scan a fundus of a subject's eye with illumination light;
• a control unit configured to control the scanning unit to two-dimensionally scan a first field of the fundus with the illumination light and two-dimensionally scan a second field different from the first field with the illumination light so that scanning lines of the first field and scanning lines of the second field are alternately arranged in a direction crossing the scanning lines;
• a front image acquisition unit configured to obtain first front images of the fundus at different times using return light from the fundus in the first field, and obtain second front images of the fundus at different times using return light from the fundus in the second field;
• and
• a detection unit configured to, in a case where at least one of the first front images is selected as a reference image, detect movement of the subject's eye using information indicating a position gap between the reference image and the first front images, and in a case where at least one of the second front images is selected as the reference image, detect the movement of the subject's eye using information indicating a position gap between the reference image and the second front images.

A method for controlling an ophthalmic apparatus including a scanning unit configured to scan a fundus of a subject's eye with illumination light, the method comprising:

• controlling the scanning unit to two-dimensionally scan a first field of the fundus with the illumination light and two-dimensionally scan a second field different from the first field with the illumination light so that scanning lines of the first field and scanning lines of the second field are alternately arranged in a direction crossing the scanning lines;
• obtaining first front images of the fundus at different times using return light from the fundus in the first field, and obtaining second front images of the fundus at different times using return light from the fundus in the second field;
• and
• in a case where at least one of the first front images is selected as a reference image, detecting movement of the subject's eye using information indicating a position gap between the reference image and the first front images, and detecting the movement of the subject's eye using information indicating a position gap between the reference image and the second front images and information indicating a difference in position between the first field and the second field.

A method for controlling an ophthalmic apparatus including a scanning unit configured to scan a fundus of a subject's eye with illumination light, the method comprising:

• controlling the scanning unit to two-dimensionally scan a first field of the fundus with the illumination light and two-dimensionally scan a second field different from the first field with the illumination light so that scanning lines of the first field and scanning lines of the second field are alternately arranged in a direction crossing the scanning lines;
• obtaining a plurality of first front images of the fundus at different times using return light from the fundus in the first field, and obtaining a plurality of second front images of the fundus at different times using the return light from the fundus in the second field;
• and
• in a case where at least one of the first front images is selected as a reference image, detecting movement of the subject's eye using information indicating a position gap between the reference image and the first front images, and in a case where at least one of the second front images is selected as the reference image, detecting the movement of the subject's eye using information indicating a position gap between the reference image and the second front images.

An ophthalmic apparatus comprising:

• a scanning unit configured to scan a fundus of a subject's eye with illumination light;
• a control unit configured to control the scanning unit to two-dimensionally scan a first field of the fundus with the illumination light and two-dimensionally scan a second field different from the first field with the illumination light so that scanning lines of the first field and scanning lines of the second field are alternately arranged in a direction crossing the scanning lines;
• a front image acquisition unit configured to obtain first front images of the fundus at different times using return light from the fundus in the first field, and obtain second front images of the fundus at different times using return light from the fundus in the second field;
• and
• a detection unit configured to, in a case where at least one of the first front images is selected as a reference image, detect a movement of the subject's eye using information indicating a position gap between the reference image and the second front images and information indicating a difference in position between the first field and the second field.