High power silver octagonal readers 1830
High power silver octagonal readers readers from the beginning of the 1800s are in good condition for being almost 200 years old.
They have the typical “crank” style bridge of the time. They also are hexagonal in shape.
The temples are the narrow sliding type,with “tear-shaped” loops on one end.
The left temple is marked “7” near the hinge. This was the way glasses were sold in those days.
It indicates the focal length of both lenses is seven inches. In today’s dioptric nomenclature, this would be the same as a +5.50 reader.
A five and a half diopter reading glass is very strong. Usually it would be for an older person who is all ready farsighted or for someone doing very close detailed work.