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In-Vivo Lens Shaping Proof of Concept
Purpose: Evaluate the feasibility to create a diopter change inide an acrylic IOL using a femtosecond laser while keeping a good MTF.
Method: Shaping a suitable lens design of a 4D RIS lens into a standard hydrophobic IOL. The measurements before and after are performed using the PMTF from Lambda X.
Results: The original IOL measured 20.6D with an MTF of 0.6, after RIS the IOL measured 24.6D with an MTF of 0.56.
Conclusion: The RIS technology can be used to change an existing IOL.
3mm Aperture Measurement
![Measurement Result. Before the refractive index treatment the intraocular lens measured 20.6 diopter with an MTF of 0.6 for the 100 linepair measurement.](images/results-3mm.png)
4.5mm Aperture Measurement
![Measurement Results for the 4.5mm aperture measurement show an improved MTF after shaping.](images/results-4_5mm.png)
Diffractive Multifocal to Monofocal
Purpose: Evaluate the possibility to change a diffractive multifocal into a monofocal IOL
Method: A suitable lens design was created to match the diffractive power and energy split of the diffractive multifocal IOL.
Results: The original IOL measured 20.85D with an add of 3.58D and a MTF of 0.37 and 0.26, after RIS shaping the IOL measured as a monofocal IOL at 21.04D with an MTF of 0.57.
Conclusion: The RIS technology can be used to change a diffractive multifocal into a monofocal IOL.
Before RIS
![Measurement Result. Before the refractive index treatment the lens measured a near and a far peak and therefore was multifocal.](/images/multi-mono-before-1.jpg)
After RIS
![Measurement Result. After the refractive index treatment the lens measured only a far peak.](/images/multi-mono-after-1.jpg)
Monofocal to Multifocal
Purpose: Evaluate the possibility to add multifocality to a monofocal IOL
Method: A suitable lens design was created a multifocality with an add of 3.6D and a 50/50 split.
Results: The IOL before RIS treatment measured 5.27D with an MTF of 0.53 for the 100lp/mm measurement. After RIS treatment the IOL measured two foci at 5.25D and 8.83D with 51/49 split.
Conclusion: The RIS technology can be used to add multifocality to monofocal IOL.
Before RIS
![Measurement result. Before the refractive index treatment the through focus curve showed only a far peak.](/images/multi-before-1.png)
After RIS
Repeatability
The next example shows the repeatability of the process. All lenses have been shaped in sequence.