Antique Chinese spectacles – unknown date
Antique Chinese spectacles. They have a latch that, if it were working, would allow the two sides to be folded together. As it is they rotate to become collapsed to fit their case. The lenses are plano-concave, in a lenticular design. They are heavy glass and are very well finished at their edges. They have about -2.00 diopters of power in each lens.