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| Why are ZO (600) lenses less sensitive to tilt & decentration? What is the profile of your optic? |
- Carl Zeiss has a long story in aspheric field and optic design.
- Profile of our optic: our patent is still pending so we can not describe how it works. But we have better prove than giving a theoretical geometry. We have clinical data with MTF curves showing the behaviour of our lenses with tilt and decentration. These good results have been obtained – amongst other things – thanks to our optimized L&B eye model which considers such imperfections.
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| Do you have any clinical data on the benefits of your ZO (600) lenses? Is the data already published? |
- There are already clinical results from three studies available:
- One mono-center Austrian study on the CT ASPHINA® 603P (XL Stabi ZO) is comparing the visual performance of this IOL vs its spherical version.
- One multi-center European study on the CT ASPHINA® 604P (Invent ZO) with centers in France, Italy and Germany. 60 patients requiring cataract surgery are enrolled (3 centers – 20 patients per center). The duration of follow-up for each patient is 12 months. This study is coordinated by D. Gatinel, MD, PhD, France.
- One multi-center French post-marketing study on the
CT ASPHINA® 603P (XL Stabi ZO) confirming through MTF measurements (Z4.0) the excellent outcomes provided by the ZEISS aspheric optic/600 concept.
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| What are the benefits of ZO (600) lenses for the patient? |
- In developing its aspheric lenses (600), Carl Zeiss brought together the best of both worlds in combining the advantages of negative SA lenses and aberration-neutral lenses to achieve maximum visual quality for largest range of patients.
- The ZEISS aspheric optic/600 concept enables the reduction of spherical aberrations while also demonstrating very low sensitivity to decentration and tilt. It improves contrast perception.
- CT ASPHINA® 603P (XL Stabi ZO) and CT ASPHINA® 604P (Invent ZO) lenses are preloaded in their cartridge to be easily implanted using the latest generation of disposable injectors SkyJet®/ SkyInvent that utilize cold plasma surface-treatment technology to ensure optimal reproducibility and injection comfort. The lens is protected at all times to avoid risk of damage, manipulation and cross contamination.
- Haptics Design: patients benefit from secure long-term lens centration and stability, and thus optimized optical performance over a longer period of time.
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| How many positive SA are the ZO (600) lenses leaving in the eye? |
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It is difficult to answer properly to this question. It depends on the pupil size and the diopter. E.g. with a 6mm pupil, a standard cornea with SA of +0,27µm, for a 22D lens +0.14 µm are left in the eye.
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| Do you have to perform an aberrometry measurement before and after cataract surgery? |
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Not before, as the crystalline is having a cataract the wavefront will not be helpful. Performing an aberrometry after could be interesting but is not necessary.
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