I believe another poster here said awhile back that the rods and cones are destroyed in patients' eyes, whose disease has progressed far enough that they'd be used in these trials and though they may have some improvement in visual acuity, it wouldn't improve their vision greatly.
Maybe the rods and cones started regenerating which allowed for a little more improvement in visual acuity than originally expected? I don't even know if that's possible, but let's hope so....
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