Postoperative modification of an intraocular lens

A system for refractive index modification of an IOL with a femtosecond laser, comprising:

• a femtosecond pulse laser system that has a femtosecond laser source, a lens, which focuses the laser beam in the eye and the IOL, and a scanner, which scans the focal point of the laser beam laterally and axially to the optical axis of the lens;
• an optical coherence tomography (OCT) measurement/imaging system that has an OCT light source/detector and a lateral scanner, which conducts the light of the OCT light source into the eye also through the lens which focuses the laser beam in the eye, and detects the light reflected by the eye or its inner structures and in which the OCT measurement/imaging system is adapted to locate at least one of a position, a location or dimensions of a pre-existing refractive index pattern inside the IOL;
• a confocal detection measurement/imaging system that has a light source/detector and a lateral scanner, which conducts the light of the light source into the eye also through the lens which focuses the laser beam in the eye, and detects the light reflected by the eye or its inner structures;
• a control device, which analyzes signals from the confocal system in order to determine the position and/or shape of the IOL in the eye, which analyzes the signals of the OCT system in order to record the position and/or expansion of a refractive index pattern inside the IOL in three dimensions, and which controls the laser system for the application of the writing pattern.

A method for refractive index modification of an IOL by application of femtosecond laser pulses, comprising:

• recording a measurement and imaging signal of the eye or of structures in the eye;
• locating a position of the IOL, a location of the IOL in the eye or both a position and a location of the IOL in the eye in the measurement and imaging signal;
• locating at least one of a position, a location or dimensions of a pre-existing refractive index pattern inside the IOL;
• and
• writing a writing pattern of femtosecond laser pulses in the IOL, taking into account data obtained regarding the position, the location or both the position and the location of the IOL in the eye.

A method for refractive index modification of an IOL by application of femtosecond laser pulses, comprising:

• recording a measurement and imaging signal of the eye or of structures in the eye;
• locating a position of the IOL, a location of the IOL in the eye or both a position and a location of the IOL in the eye in the measurement and imaging signal;
• and
• writing a writing pattern of femtosecond laser pulses in the IOL, taking into account data obtained regarding the position, the location or both the position and the location of the IOL in the eye;
• locating at least one of a position, a location or dimensions of a pre-existing refractive index pattern inside the IOL;
• writing the writing pattern of femtosecond laser pulses in the IOL, taking into account, in addition to the data obtained regarding the position, the location or both the position and the location of the IOL in the eye, data regarding at least one of the position, location or dimensions of a refractive index pattern inside the IOL.