Jackson’s Cross Cylinder (JCC): The Best Guide for Optometrists

Jackson’s Cross Cylinder (JCC) is an essential tool in clinical refraction used to refine the cylinder power and axis in astigmatic patients.

Jackson’s Cross Cylinder (JCC): The Best Guide for Optometrists

Jackson’s Cross Cylinder (JCC) Jackson’s Cross Cylinder (JCC) is an essential tool in clinical refraction used to refine the cylinder power and axis in astigmatic patients. It plays a pivotal role in achieving optimal visual clarity and precision in spectacle prescriptions. This post will explore JCC in detail — its components, working principle, procedure, and interpretation — along with commonly asked interview questions. What is Jackson’s Cross Cylinder (JCC)? Jackson’s Cross Cylinder is a bitoric lens used to refine astigmatism correction during subjective refraction. It is mounted in a handle and consists of two equal but opposite cylindrical powers at perpendicular axes, such as: +0.25 D / -0.25 D +0.50 D / -0.50 D This means one axis is plus and the axis 90° away is minus. Purpose of JCC JCC is mainly used to: Refine the cylinder axis . Refine the cylinder power . Confirm the correctness of astigmatic correction. Structure of JCC Two cylindrical lenses of equal magnitude but opposite signs . Ma…

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