Ophthalmic photographing apparatus

An ophthalmic photographing apparatus comprising:

• an anterior ocular segment illumination unit for illuminating an anterior ocular segment of a subject eye with invisible light;
• an imaging element that is sensitive to at least invisible light and that captures an image of the subject eye;
• and
• a processor for processing the image captured by the imaging element, wherein
• when an image of an index projected onto the anterior ocular segment satisfies a predetermined condition, the processor starts detection of a pupil diameter of the subject eye by using the image on the imaging element formed by reflected light from the anterior ocular segment, which is reflected light of invisible light emitted from the anterior ocular segment illumination unit,
• wherein the processor scans luminance values along a virtual line within the image, the virtual line intersecting with at least a boundary between an iris and a pupil of the subject eye, and wherein the processor detects the pupil diameter from a position of a boundary point between the iris and the pupil of the subject eye extracted based on a change amount of the luminance values.