System and method for assisting a subject with alignment to an ophthalmologic device

A method for assisting a subject with alignment with an ophthalmologic device, the method comprising:

• respectively transmitting light having first and second optical characteristics from first and second fixation targets located in a first plane;
• spatially filtering the light transmitted from the first and second fixation targets using first and second apertures located in a second plane;
• optically filtering the spatially filtered light from the first fixation target to have the first optical characteristic;
• optically filtering the spatially filtered light from the second fixation target to have the second optical characteristic;
• and
• imaging the first and second apertures in the second plane to a third plane approximately corresponding to the subject's pupil, using at least one lens,
• wherein, based upon the ophthalmologic device being misaligned with the subject's pupil in approximately the third plane, the subject's pupil blocks the image of at least one of the first and second apertures such that the subject's retina receives an image of at most one of the first and second fixation targets;
• and
• wherein, based upon the ophthalmologic device being aligned with the subject's pupil in approximately the third plane:
• the subject's pupil substantially transmits the images of the first and second apertures such that the subject's retina receives an image of the first and second fixation targets, and
• light from the first light source of the ophthalmologic device enters the subject's pupil, is reflected or scattered by the subject's retina, exits the subject's pupil, and is received by the image sensor.

A system for assisting a subject with alignment with an ophthalmologic device comprising a light source and an image sensor, the system comprising:

• a source of coherent light located in a first plane;
• first and second apertures located in a second plane and configured to spatially filter the light transmitted from the source of coherent light;
• and
• at least one lens configured to image the first and second apertures in the second plane to a third plane approximately corresponding to the subject's pupil,
• wherein, based upon the ophthalmologic device being misaligned with the subject's pupil in approximately the third plane, the subject's pupil blocks the image of at least one of the first and second apertures such that the subject's retina receives light from at most one of the first and second apertures;
• and
• wherein, based upon the ophthalmologic device being aligned with the subject's pupil in approximately the third plane:
• the subject's pupil substantially transmits the images of the first and second apertures such that the subject's retina receives an interference pattern generated by light from the first and second apertures, and
• light from the light source of the ophthalmologic device enters the subject's pupil, is reflected or scattered by the subject's retina, exits the subject's pupil, and is received by the image sensor.

A method for assisting a subject with alignment with an ophthalmologic device comprising a light source and an image sensor, the system comprising:

• spatially filtering coherent light transmitted from a source in a first plane using first and second apertures located in a second plane;
• and
• imaging the first and second apertures in the second plane to a third plane approximately corresponding to the subject's pupil,
• wherein, based upon the ophthalmologic device being misaligned with the subject's pupil in approximately the third plane, the subject's pupil blocks the image of at least one of the first and second apertures such that the subject's retina receives light from at most one of the first and second apertures;
• and
• wherein, based upon the ophthalmologic device being aligned with the subject's pupil in approximately the third plane:
• the subject's pupil substantially transmits the images of the first and second apertures such that the subject's retina receives an interference pattern generated by light from the first and second apertures, and
• light from the light source of the ophthalmologic device enters the subject's pupil, is reflected or scattered by the subject's retina, exits the subject's pupil, and is received by the image sensor.