Ophthalmic apparatus, method of controlling same, and recording medium

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit and configured to generate slit-shaped illumination light by irradiating light from a light source onto the slit, the slit being movable in an optical axis direction of the illumination optical system and capable of being arranged at a position substantially conjugate optically to a fundus of a subject's eye, and at least one of a relative position of the light source to the slit, or a relative orientation of the light source to the slit is configured to be changeable as the slit moves;
• an optical scanner configured to deflect the illumination light to guide the illumination light to the fundus of the subject's eye;
• an imaging optical system configured to guide returning light of the illumination light from the fundus to an image sensor;
• a controller configured to control the optical scanner;
• and
• an image forming unit configured to form an image of the fundus based on a light receiving result captured in an imaging target region on a light receiving surface of the image sensor, wherein
• the image sensor is configured to capture the light receiving result in an opening region on the light receiving surface using a rolling shutter method, the opening region corresponding to an illumination region of the illumination light on the fundus, the illumination region being moved in a predetermined scan direction by the optical scanner,
• the controller is configured to control the optical scanner so that irradiation times of the returning light at a plurality of light receiving elements in the imaging target region are equal,
• the image sensor includes a plurality of light receiving elements arranged in a column direction, with light receiving element groups arranged in a row direction orthogonal to a shift direction of the opening region shifted corresponding to the illumination region,
• a width in the shift direction of an irradiated range on the light receiving surface corresponding to the illumination region has a width for two or more rows,
• the controller is configured to control the optical scanner so that the irradiated range shifts from outside the imaging target region in the shift direction in units of a predetermined number of rows,
• the controller is configured to control the optical scanner so that the irradiated range shifts from outside the imaging target region by a predetermined width greater than the width in the shift direction of a region corresponding to the illumination region on the light receiving surface, and
• the predetermined width is a sum of the width in the shift direction of the region corresponding to the illumination region on the light receiving surface and a width for the number of rows corresponding to an operation unstable region of the optical scanner.