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I'm 60+ and wear trifocals

50y silhouette matches are a challenge visually

tried the Merit eyepiece and it didn't work for me

found out I had to use it for several range trips before it began to work as advertised

maybe my eyes and brain got trained

Won my class in both Irons and Optics last week

Shot my first perfect 10 and that was with iron sights

I'm sold on the Merit now. (also used an opaque, flip up, eye piece on my weak eye)

for those like me that had no clue
http://www.meritcorporation.com/index-2.html

Had a Merit #3 on my 52D target rifle forever. Never tried the one for pistol shooting and because "magnifying lenses" were against the rules in the competition I participated in, also never tried one of the diopter lenses.

I used it for about 10 years. It is the only way that I can see both my front sight and the target, with both in focus.

With bifocals, I can focus on the front sight, but the target is blurry. Alternatively, I can focus on the target, but the front sight is blurry.

Note it is useful for traditional target shooting, but it is worthless (too slow) for action pistol sports like USPSA or IDPA.