The cylinder lines will focus at a more minus power reading than the sphere lines when neutralizing a lens in minus cylinder.

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

The cylinder lines will focus at a more minus power reading than the sphere lines when neutralizing a lens in minus cylinder.

Explanation:
In a lens with minus cylinder, one principal meridian carries only the sphere power, while the meridian 90 degrees away carries sphere power plus the cylinder power. Since the cylinder power is negative, that perpendicular meridian becomes more minus than the axis meridian. So during neutralization, the cylinder meridian shows a stronger minus reading than the sphere meridian. For example, if the sphere is -2.00 D and the cylinder is -1.00 D, the axis meridian is -2.00 D while the perpendicular meridian is -3.00 D. That’s why the cylinder lines focus at a more minus reading than the sphere lines.

In a lens with minus cylinder, one principal meridian carries only the sphere power, while the meridian 90 degrees away carries sphere power plus the cylinder power. Since the cylinder power is negative, that perpendicular meridian becomes more minus than the axis meridian. So during neutralization, the cylinder meridian shows a stronger minus reading than the sphere meridian. For example, if the sphere is -2.00 D and the cylinder is -1.00 D, the axis meridian is -2.00 D while the perpendicular meridian is -3.00 D. That’s why the cylinder lines focus at a more minus reading than the sphere lines.

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