Which statement best contrasts the old crossed-cylinder method with the cross-cyl calculator approach?

• A. The old method was faster and more accurate
• B. The cross-cyl calculator relies solely on trial frames
• C. The old method stacked SCL and SCOR powers and read with a lensometer; the new method uses a cross-cyl calculator to tailor a diagnostic lens based on refractive and lens parameters plus eye rotation
• D. They are identical in approach

Answer: (C)