Ophthalmic apparatus and method of controlling the same

A method of controlling an ophthalmic apparatus that includes a fixation target presenter including a light source or a liquid crystal display (LCD) and configured to present a fixation target to a subject, a scanner configured to apply optical coherence tomography (OCT) scanning to an anterior eye segment of a subject's eye, and at least one processor, the method being configured to cause the at least one processor to perform:

• constructing an image based on data collected by the scanner;
• generating tilt information that represents a tilt state of the anterior eye segment depicted in the image;
• controlling the fixation target presenter based on the tilt information;
• controlling the fixation target presenter to move the fixation target;
• and
• controlling the fixation target presenter with referring to correspondence information generated in advance that represents correspondence between a tilt parameter representing a tilt state of an anterior eye segment in an image frame and a movement parameter of a fixation target, wherein
• the tilt information includes a tilt angle with respect to a predetermined first reference direction in the image constructed by the OCT imager,
• the tilt parameter includes a tilt angle with respect to a predetermined second reference direction in the image frame, and
• the movement parameter includes a movement amount.

An ophthalmic apparatus comprising:

• a fixation target presenter including a light source or a liquid crystal display (LCD) and configured to present a fixation target to a subject;
• an OCT imager configured to apply optical coherence tomography (OCT) scanning to an anterior eye segment of a subject's eye to construct an image;
• a tilt information generator configured to generate tilt information that represents a tilt state of the anterior eye segment depicted in the image;
• and
• a controller configured to control the fixation target presenter based on the tilt information,
• wherein the tilt information generator is configured to analyze the image constructed by the OCT imager to identify at least one feature point and perform generation of the tilt information based on the at least one feature point, and
• wherein the at least one feature point includes one or more of:
• a corner angle, an apex of an anterior surface of a crystalline lens, a corneal apex, and a point on an anterior surface of an iris.

A method of controlling an ophthalmic apparatus that includes a fixation target presenter including a light source or a liquid crystal display (LCD) and configured to present a fixation target to a subject, a scanner configured to apply optical coherence tomography (OCT) scanning to an anterior eye segment of a subject's eye, and at least one processor, the method being configured to cause the at least one processor to perform:

• constructing an image based on data collected by the scanner;
• generating tilt information that represents a tilt state of the anterior eye segment depicted in the image;
• and
• controlling the fixation target presenter based on the tilt information, wherein
• said generating the tilt information includes analyzing the image constructed by the OCT imager to identify at least one feature point and perform generation of the tilt information based on the at least one feature point, and
• the at least one feature point includes one or more of:
• a corner angle, an apex of an anterior surface of a crystalline lens, a corneal apex, and a point on an anterior surface of an iris.