If the sphere lines are focused and unbroken at +3.00, axis 90, and the cylinder lines focus at +1.00, how would the prescription be recorded?

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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

If the sphere lines are focused and unbroken at +3.00, axis 90, and the cylinder lines focus at +1.00, how would the prescription be recorded?

Explanation:
In a spherocylindrical prescription, the axis marks the meridian with no cylinder power, and the cylinder power is added to the perpendicular meridian. With the axis at 90 degrees, the 90-degree meridian carries the sphere power of +3.00. The other meridian (180 degrees) must have a total power of +1.00, as given by the focus of the cylinder lines. So the cylinder power added to the sphere to reach +1.00 is: Cyl = +1.00 − +3.00 = −2.00. Therefore, the correct recording is +3.00 −2.00 X 90, which means +3.00 sphere, −2.00 cylinder, axis 90. This yields powers of +3.00 at 90 degrees and +1.00 at 180 degrees.

In a spherocylindrical prescription, the axis marks the meridian with no cylinder power, and the cylinder power is added to the perpendicular meridian. With the axis at 90 degrees, the 90-degree meridian carries the sphere power of +3.00. The other meridian (180 degrees) must have a total power of +1.00, as given by the focus of the cylinder lines. So the cylinder power added to the sphere to reach +1.00 is: Cyl = +1.00 − +3.00 = −2.00. Therefore, the correct recording is +3.00 −2.00 X 90, which means +3.00 sphere, −2.00 cylinder, axis 90. This yields powers of +3.00 at 90 degrees and +1.00 at 180 degrees.

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