Before revision: The American Optical Ultramatic RxMaster of 1967The major components of the phoropter are the battery of spherical and cylindrical lenses, auxiliary devices such as Maddox rods, filtered lenses, prisms, and the JCC (Jackson Cross-Cylinder ) used for astigmatism measurement.
After revision: The American Optical Ultramatic RxMaster of 1967The major components of the phoropter are the battery of spherical and cylindrical lenses, auxiliary devices such as Maddox rods, filtered lenses, prisms, and the JCC (Jackson cross cylinder ) used for astigmatism measurement.