Which statement about SCOR is true?

Which statement about SCOR is true?

• A. SCOR cannot affect cylinder orientation
• B. SCOR is always perfect
• C. SCOR is irrelevant to toric lenses
• D. SCOR can produce oblique crossed cylinder

Answer: (D)

SCOR relates to how the cylindrical correction is oriented and rotated within a toric lens. By adjusting this orientation, the cylindrical powers can be aligned along oblique directions, creating a situation known as oblique crossed cylinder. This is important because astigmatism can act along axes that are not simply horizontal or vertical, so being able to produce an oblique crossed cylinder means the lens can correct oblique astigmatism effectively. The idea that SCOR cannot affect cylinder orientation, or that SCOR is always perfect, or that SCOR is irrelevant to toric lenses, conflicts with how toric corrections rely on the orientation of the cylinder to achieve the desired refractive effect.

SCOR relates to how the cylindrical correction is oriented and rotated within a toric lens. By adjusting this orientation, the cylindrical powers can be aligned along oblique directions, creating a situation known as oblique crossed cylinder. This is important because astigmatism can act along axes that are not simply horizontal or vertical, so being able to produce an oblique crossed cylinder means the lens can correct oblique astigmatism effectively. The idea that SCOR cannot affect cylinder orientation, or that SCOR is always perfect, or that SCOR is irrelevant to toric lenses, conflicts with how toric corrections rely on the orientation of the cylinder to achieve the desired refractive effect.