NUOLUX 2Pcs Professional Cylinder Lens Multi-function Cross Cylinders Convenient Optometry Tools

Please kindly noted that this item is sold by Binacious from Joybuy marketplace.Description The cross cylinder lens with opposite axial refractive power usually used for astigmatism. Place the cross cylindrical lens on the cylindrical lens money to make an axis coincide with the cylindrical lens axis and then reverse the cross cylindrical lens to rotate the axis certain degrees. Features -Color: Silver -Material: Optical glass and zinc alloy -Size (50 degree): 10.80X3.80X0.40cm/ 4.24X1.49X0.16inch -Made of high-class material great processes durable for a long time use. -When correcting the axial direction the two axes of the cross cylindrical lenses can be placed at 45 degrees of the cylindrical lenses. -The cross cylinder lens is mainly used for optometry a good helper for experiment. -Fine workmanship and good material ensure its durability and practicality. -Handheld design simple and portable easy to use carry and store.