Thanks to all who have posted on this site, which was helpful to me as I started my own search. If you are considering a lens exchange, I'd like to recommend Dr. Robert Fish at Colorado Eye Consultants. Last Fall after cataract surgery on my first eye I was rattled by positive dysphotopsias with indoor lighting. The IOL was a Vivity, acrylic. Two local ophthalmologists and one optometrist discouraged a lens exchange, saying it was too risky. I read whatever pertinent studies and literature I could find online, reading among other things that timing was important. Eventually, I learned of Colorado Eye Consultants. Four months after my initial surgery, Dr. Fish replaced the acrylic Vivity with the Bausch & Lomb L161A0, which is silicone. For the first couple of weeks I had peripheral sparkles but none of the penetrating arcs and streaks that had been so upsetting. The sparkles then disappeared. Because a toric L161A0 isn't available, I still need correction for astigmatism, which to me is a minuscule trade-off. Needless to say, I'm elated with the success and hugely grateful to this surgeon.