Quote Originally Posted by Dr. Bill Stacy View Post
Are you new in optical? I think you are referring to FT-28 (flat-top 28 mm wide bifocal) or Flat-top 35 (flat-top 35 mm wide bifocal). These are also sometimes called ST-28 (for straight top) and D-28 (for D shape rotated 45 degrees). Your use of 7x28 refers to a trifocal which is 28 mm wide and has an intermediate seg height of 7 mm.
If the horse you happen to be riding dies, it is usually best to get off.