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FWIW, what I did:
I finally went to tri-focals. In IPSC I used the Weaver stance. I had an additional lens-insert, about 1/2" x 3/4", glued to the upper segment of the master-eye lens, right by my nose. The diopter was the same as the middle part of the tri-focal lens.
The sights were razor sharp. The target was slightly blurred, but not to any detrimental degree.
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