Methods and systems for inspecting the alignment of the eye in an ophthalmological imaging apparatus

A system for controlling alignment of the eye in an ophthalmological imaging device comprising an imaging system with an imaging plane and a given optical axis, said system for controlling alignment of the eye comprising:

• an imaging optical element having a given optical axis and configured to form an image of at least one element located in a plane of the pupil of the eye;
• an image-acquiring device comprising a two-dimensional detection plane, said acquiring device being configured to acquire said at least one image of said at least one element, said detection plane being inclined such that a normal to the detection plane makes a non-zero angle to said optical axis of the imaging optical element;
• a control unit configured to:
• determine a lateral position of the pupil of the eye with respect to a point of origin of a reference frame of the imaging system based on the position of said at least one image in said detection plane;
• analyze a state of focus of said at least one image in at least two regions of the detection plane, said regions being arranged in a direction of sharpness variation defined by the intersection of the detection plane with a plane formed by a normal to the detection plane and said optical axis of the imaging optical element;
• determine an axial position of the pupil of the eye with respect to said point of origin of the reference frame of the imaging system based on said analysis of the state of focus.