Patent ID: 11950845
Assignee: ALCON INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A method for determining a location of a visual axis of a patient's eye, comprising:
placing a multifocal optical lens adjacent to the patient's eye, the multifocal optical lens comprising two or more optical powers with corresponding spatially coinciding optical centers at an optical center of the multifocal optical lens;
generating and directing a fixation light towards the patient's eye, the fixation light forming two or more images at focal points near a retina of the patient's eye, the two or more images corresponding to the two or more optical powers of the multifocal optical lens;
capturing images of the patient's eye and the multifocal optical lens along a direction of the fixation light;
determining an X/Y location of the patient's eye relative to an X/Y location of the optical center of the multifocal optical lens;
moving the multifocal optical lens with respect to the patient's eye while the patient maintains their gaze on the fixation light until centers of the two or more images coincide in a view of the patient; and
identifying the location of the visual axis of the patient's eye at a pupil plane of the patient's eye, the location of the visual axis corresponding with a location of the optical center of the multifocal optical lens as viewed from the direction of the fixation light.