Merit Optical , or other suggestions for an optical aid .. Please

Well my eyes have finally gotten old enough that I can't see the front sight without some help. 
Does anyone make a optical aid better than the MERIT - DELUXE OPTICAL ATTACHMENT?
  If there is something else I should be looking at? Please let me know ..

  Thanks .. K

Champions Choice has some clip-on readers that might help.  If your far vision is still good, perhaps switching to a red dot is a better choice?

I have two pistols I shoot.  One already has a red dot on it.

+1 reading glasses, center of mass (blob, don't expect to see a sharp bullseye) will help a lot. If you can, use a reddot, instead.