optical lens
Optical glass confirmation flipper lenses, diameter up to request: cylinder shpere +/- 0.25, 0.50, 0.75, 1.00, 1.50, 2.00. +/- 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00. round prism, ocluder, maddox,porarized, cross...