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Using the Jackson Cross Cylinder to Determine the Cylinder Axis
Hold the JCC so that the handle aligns along the axis of the cylindrical lens in the trial frame. Flip the cross cylinder and determine which orientation the patient prefers. Rotate the cylinder in the trial frame towards the side of the same cylinder sign on the JCC. Repeat until the patient does not have a preference for one orientation.
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Vitreoretinal Surgery Online
This open-source textbook provides step-by-step instructions for the full spectrum of vitreoretinal surgical procedures. An international collaboration from over 90 authors worldwide, this text is rich in high quality videos and illustrations.