Optical system to objectively identify and track accommodation of an intraocular lens and methods of use

A method of using an optical system to assess patient refraction comprising:

• directing infrared light from an infrared light source onto a retina of an eye during a test;
• continuously recording Shack-Hartmann centroids from the eye with a wavefront camera at a sampling rate during the test providing a wavefront camera output;
• and
• continuously recording video of the eye from the retro-illumination light returned from the eye at the sampling rate during the test by an infrared-sensitive pupil camera providing a pupil camera output.

A method of assessing patient refraction comprising:

• performing gross alignment of an optical system comprising:
• a physical target positionable during a test between a first distance and a second distance;
• an illuminating light source;
• a measurement light source configured to project a laser spot;
• an infrared-sensitive pupil camera;
• and
• a wavefront camera;
• projecting light from the illuminating light source of the optical system towards a patient so an eye to be measured is in view of the pupil camera and the wavefront camera;
• aligning the distance target with the laser spot visible to the patient;
• aligning the near target with the laser spot visible to the patient;
• and
• performing the test on the eye while operating the wavefront camera and the pupil camera at a sampling rate to obtain pupil camera output and wavefront camera output that is near synchronous.