5 Key Takeaways

• 1

  Experts described the Jackson cross cylinder as a tool for determining both cylinder axis and power.

• 2

  For axis refinement, offer the patient choices of one, two, or the same, then turn the axis knob 10° toward the preferred choice and repeat.

• 3

  If the patient wants to return during axis refinement, turn the axis knob 5° in that direction; stop when the patient says the views appear the same.

• 4

  The Jackson cross cylinder has +0.25 and −0.25 power on opposite sides, with its axes 90° apart.

• 5

  For plus-cylinder refinement, the experts advised straddling the axis with the dots, following the white dot for axis, and adding power with white or subtracting with red.