Donegan Optical OptiVISOR LX Binocular Lensplate #4 Magnifies 2X at 10-inch, Other, Multicoloured, 5.08 x 20.32 x 29.59 cm

Can anyone tell me the difference between the OptiVisor and just using the "cheater" magnifying glasses that are sold at the drug store?

Hi. My boss wants me to get the ones with the #4 on the top left corner of the lensplate, please direct me to exact item to purchase. Need 3 sets

Why this optivisor has a white color lents not blue like the original is his fake?

where is this made?