Which "Optivisor" is best for you? - 8 photos

 I've used this particular "Optivisor #5" for my Diamond Setting as long as I can remember. The magnification strength is less strenuous on my eyes as well. I can wear them literally for hours with no strain on my eye. Of course, it's imperative to take them off once in a while.

 There is a head-band that sits against the forehead of the wearer. It fits so smoothly and is totally soft to the skin, these can be bought separately, if needed.

 This is the magnification of about 2.5x power just strong enough to have the setter see his stones.

 I saw that some of these lens come in 'sets' and can be purchased as a group. All the wearer can do is to unscrew the side bolts and insert a different lens. GREAT IDEA!  

 

 For a different option, is that a lens can be attached and swung into place in front of the Optivisor on either side. When not in use, it can be rotated away from being used. WOW, I wish that I had these years ago.

 In my estimation, the magnification of #7 can be a bit too powerful for continued use. That is why a #5 lens 'is the best'. But it is there, ONLY if the need arises.

 Please excuse the glue as the screw got lost and I reattach the lens quickly, then I had to buy another #7 lens.

 In previous years, the jeweller or setter fitted their own 'prescription lens' inside the frame. If the magnifying lens wasn't needed, all they would do is to just lift up the attached lens.

 BTW, these glasses belonged to my Dad and his 'hand-held' weigh scale shows the size is in the background, circa 1940's.

Nice pair of glasses, but there is little option of inserting any prescription lens, pity!