Spancare 2Pcs Round Optical Cross Cylinder Lens Optical Instruments diopters (0.25/0.5)

Round Optical Cross 2Pcs Round Optical Cross Cylinder Lens Optical Instruments diopters (0.25/0.5) Lens Power: -+25+50 , Handle Size: 3CM Brand new imported Type: Other, Item Name: Cross Cylinder, Material: Glass Jackson Cross Cylinder is a lens of fundamental importance in optometry with a key role in the refraction routine The powers of all Jackson cross-cylinders lie in the plane of anastigmatic powers in the abstract space