Systems and methods for improving vision from an intraocular lens in an incorrect position and using refractive index writing

A system for improving vision of a subject, the system comprising:

• at least one sensor configured to sense:
• a tilt of at least one optical element relative to a reference line corresponding to alignment of the apex of the cornea, center of the pupil, center of an intraocular lens (IOL), and fovea, wherein the tilt produces an imperfection in foveal vision in the subject;
• a control system operatively coupled to the at least one sensor and configured to:
• receive data indicative of a photic phenomenon experienced by the subject;
• receive associated sensed data corresponding to the tilt;
• calculate, based at least on the sensed data:
• a multi-layered phase change pattern to produce on the IOL, that is configured to compensate for the tilt by induction of a left-right asymmetry in multiple layers that have a prismatic effect to improve the foveal vision of the subject;
• a first pattern comprised of a first plurality of pulses of radiation to apply to the IOL to produce the phase change pattern;
• one or more first selected areas of the IOL to which the first plurality of pulses are to be applied;
• a second pattern comprising a second plurality of pulses of radiation to apply to the IOL to produce a radially dependent phase shift in the IOL to compensate for a phase delay of the IOL and the photic phenomenon;
• and
• one or more second selected areas of the IOL to which the second plurality of pulses are to be applied;
• and
• a pulsed radiation system operatively coupled to the control system and configured to, based on control by the control system, apply the first plurality of pulses of radiation to the IOL according to the first pattern to produce, by refractive index writing on the IOL, the phase change pattern on the IOL that is configured to compensate for the tilt to improve the foveal vision of the subject, and to apply the second plurality of pulses of radiation to the IOL according to the second pattern to produce the phase shift in the IOL to compensate for the phase delay and the photic phenomenon, wherein the control system is configured to determine the phase change pattern based at least in part on biometrics associated with corneal power.