thanks for your links, drew. i'm past 70, and started taking areds for the beginning of md in my right (master) eye about 1.5 years ago. my uncorrected vision is quite poor - in glasses since 1959 - at my worst i was 20/240 left and 20/280 right. i am still corrected to 20/20-30 in both, but with slightly better vision in left and possible md damage in right i can "see" potential for issues in my future.
the segment by dr. colo was quite interesting, and i caught his reference to central vision. once in a while i will look through the offerings on the english site
https://www.gunstar.co.uk/. over the years there will be a rare offering of a double that is described as "central vision". makes sense that the brits would develop the most careful means of proper fitting, and the good doctor's explanation helps me understand what is at play.