Facharzt FMH Ophthalmologie Practice Questions - Facharzt FMH Für Ophthalmologie Spécialiste FMH En Ophtalmologie Specialista FMH In Oftalmologia Exam

Access More Questions

When refining the astigmatic axis using a Jackson cross-cylinder (JCC), how should the handle and principal axes of the cross-cylinder lens be aligned relative to the trial cylinder axis in the phoropter?

The principal axes (+0.25 D and -0.25 D) are aligned at 45° to the trial cylinder axis, while the handle is perpendicular to the cylinder axis. The positive principal axis is aligned parallel to the trial cylinder axis, while the handle is at 45°. The negative principal axis is aligned parallel to the trial cylinder axis, while the handle is at 90°. The handle of the Jackson cross-cylinder is aligned directly parallel to the trial cylinder axis, positioning the principal power axes 45° straddling the axis.

Correct Answer:

The handle of the Jackson cross-cylinder is aligned directly parallel to the trial cylinder axis, positioning the principal power axes 45° straddling the axis.

Access more questions from this quiz

Continue to Facharzt FMH Ophthalmologie Practice Questions - Facharzt FMH für Ophthalmologie Spécialiste FMH en ophtalmologie Specialista FMH in oftalmologia Exam for more practice questions and the full quiz experience.

Access More Questions