Set of 3 Jackson Crossed Metal(0.25, .50 and 1.00 lenses)

3 Jackson Cross Cylinders with Metal Case

Set of 3 Jackson Cross Cylinders in a metal box with 0.25, .50 and 1.00 lenses. Used to determine orientation of astigmatism correction, the power of the astigmatism correction and the axis. Lenses are 35mm with axis markings and handles are 70mm long.