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6th generation Crystalens

I see that Harvard Eye Assoc in California is currently participating in a research study of a sixth generation CrystaLens implant for Presbyopia and Astigmatism.  Anybody have any clue on what the difference is between the current CrystaLens and a "6th" generation?
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711220 tn?1251891127
It maybe to extend the range of Trulign,  the Toric Crystalens.  Ask them.

Dr. O.

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