PNO Oftalmologia CBO Practice Questions - PNO - Prova Nacional De Oftalmologia Título De Especialista Em Oftalmologia (Conselho Brasileiro De Oftalmologia AMB) Exam

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During subjective manifest refraction using a Jackson Cross-Cylinder (JCC) with ±0.25 D powers to refine the cylinder axis, how should the JCC be oriented relative to the correcting cylinder axis, and how should the axis be adjusted when the patient prefers a flip position?

Align the handle of the JCC parallel to the trial cylinder axis (placing JCC axes at 45° to the trial axis), and rotate the trial cylinder axis toward the red (minus) mark on the preferred flip position. Align the red (minus) axis of the JCC directly over the trial cylinder axis, and rotate the trial cylinder axis away from the red mark. Align the white (plus) axis of the JCC directly over the trial cylinder axis, and increase the sphere power by +0.25 D for every 5° of axis rotation. Align the handle of the JCC at 45° to the trial cylinder axis, and rotate the trial cylinder axis toward the white (plus) mark regardless of whether plus or minus cylinder is used.

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